Xilinx LogiCORE Endpoint v2.4 User Manual Download Page 29

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Ethernet AVB Endpoint User Guide

www.xilinx.com

UG492 September 21, 2010

Chapter 3

Overview of Ethernet Audio Video
Bridging

Figure 3-1

illustrates a potential home network, consisting of wired (ethernet) and wireless

components, which utilize the technology being defined by the IEEE802.1 Audio Video
Bridging Task Group. This illustrates potential audio/video

talkers

(for example, a Cable or

Satellite Content Provider, or home MP3 player) and a number of potential

listeners

(for

example TV sets which may exist in several rooms). In addition, users of the various
household PCs may be surfing the internet. It is important to note that all of this data is
being transferred across the single home network backbone.

X-Ref Target - Figure 3-1

Figure 3-1:

Example AVB Home Network

Home Network

Home Network (wired)

Home Network
(wirele

)

DVD pl

yer

Bro

tellite

Terre

tri

Bro

Summary of Contents for LogiCORE Endpoint v2.4

Page 1: ...LogiCORETM IP Ethernet AVB Endpoint v2 4 User Guide UG492 September 21 2010...

Page 2: ...tocopying recording or otherwise without the prior written consent of Xilinx 2008 2010 Xilinx Inc XILINX the Xilinx logo Virtex Spartan ISE and other designated brands included herein are trademarks o...

Page 3: ...24 Additional Core Resources 24 Technical Support 24 Feedback 24 Ethernet AVB Endpoint Core 24 Document 25 Chapter 2 Licensing the Core Before you Begin 27 License Options 27 Simulation Only 27 Full S...

Page 4: ...recise Timing Protocol Blocks 44 Software Drivers 46 Tri Mode Ethernet MACs 46 Core Interfaces 47 Clocks and Reset 47 Legacy Traffic Interface 48 AV Traffic Interface 49 Tri Mode Ethernet MAC Client I...

Page 5: ...90 Ethernet AVB Endpoint Address Space 92 Tri Mode Ethernet MAC Address Space 100 Chapter 11 Constraining the Core Required Constraints 103 Device Package and Speedgrade Selection 103 I O Location Co...

Page 6: ...Next 142 Chapter 15 Detailed Example Design Standard Format Directory and File Contents 144 project directory 144 project directory component name 145 component name doc 145 component name example des...

Page 7: ...a 161 pcores eth_avb_endpoint_v2_04_a data 161 pcores eth_avb_endpoint_v2_04_a hdl vhdl 162 pcores eth_avb_endpoint_v2_04_a netlist 162 MyProcessorIPLib drivers avb_v2_04_a 162 drivers avb_v2_04_a dat...

Page 8: ...8 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010...

Page 9: ...e 6 2 Legacy Frame Transmission with Underrun 59 Figure 6 3 Normal Frame Transmission across the AV Traffic Interface 60 Figure 6 4 Credit based Shaper Operation 62 Chapter 7 Ethernet AVB Endpoint Rec...

Page 10: ...ection to the Virtex 5 FPGA Embedded Tri Mode Ethernet MAC and Ethernet Statistic Core 118 Figure 12 5 Connection of the Ethernet AVB Endpoint Core into an Embedded Processor Sub system 120 Figure 12...

Page 11: ...September 21 2010 Chapter 16 Detailed Example Design EDK format Appendix A RTC Time Stamp Accuracy Figure A 1 RTC Periodic Error 168 Figure A 2 RTC Sampling Logic 169 Figure A 3 Sampling Position Unc...

Page 12: ...12 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010...

Page 13: ...ble 5 8 Tri Mode Ethernet MAC Host Interface Configuration Status 51 Table 5 9 PLB Signals 53 Table 5 10 Interrupt Signals 55 Table 5 11 PTP Signals 56 Chapter 6 Ethernet AVB Endpoint Transmission Cha...

Page 14: ...n Registers 98 Table 10 17 Tri Mode Ethernet MAC and Ethernet Statistics Configuration Registers 100 Chapter 11 Constraining the Core Chapter 12 System Integration Chapter 13 Software Drivers Chapter...

Page 15: ...Endpoint User Guide www xilinx com 15 UG492 September 21 2010 Table 16 7 Driver Data Directory 163 Table 16 8 Driver Example Directory 163 Table 16 9 Driver Source Directory 164 Appendix A RTC Time St...

Page 16: ...16 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010...

Page 17: ...the core using the CORE Generator software Chapter 5 Core Architecture describes the major functional blocks of the Ethernet AVB Endpoint core Chapter 6 Ethernet AVB Endpoint Transmission describes d...

Page 18: ...me stamps essential to the Precise Timing Protocol across the network link and provides some of the ways inaccuracies are introduced Conventions This document uses the following conventions An example...

Page 19: ...itive material that has been omitted allow block block_name loc1 loc2 locn Notations The prefix 0x or the suffix h indicate hexadecimal notation A read of address 0x00112975 returned 45524943h An _n m...

Page 20: ...uence FIFO First In First Out FPGA Field Programmable Gate Array Gbps Gigabits per second GMII Gigabit Media Independent Interface GUI Graphical User Interface HDL Hardware Description Language IES In...

Page 21: ...Stream Reservation Protocol TEMAC Tri Mode Ethernet MAC TCP IP Transmission Control Protocol Internet Protocol TOE TCP IP Offload Engine Tx Transmitter UCF User Constraints File us microseconds VHDL V...

Page 22: ...22 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Preface About This Guide...

Page 23: ...nd VHDL formats System Requirements Windows Windows XP Professional 32 bit 64 bit Windows Vista Business 32 bit 64 bit Linux Red Hat Enterprise Linux WS v4 0 32 bit 64 bit Red Hat Enterprise Desktop v...

Page 24: ...Ethernet AVB Endpoint core see the following documents available from the product page Ethernet AVB Endpoint Data Sheet Ethernet AVB Endpoint User Guide From the document directory after generating th...

Page 25: ...ck Document For comments or suggestions about this document submit a WebCase from www xilinx com support clearexpress websupport htm Be sure to include the following information Document title Documen...

Page 26: ...26 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Chapter 1 Introduction...

Page 27: ...e a license option Simulation Only The Simulation Only Evaluation license key is provided with the ISE CORE Generator tool This key lets you assess core functionality with either the example design pr...

Page 28: ...ow the instructions to install the required Xilinx ISE software and IP Service Packs Obtaining a Full License Key To obtain a Full license key please follow these instructions 1 Purchase the license t...

Page 29: ...potential audio video talkers for example a Cable or Satellite Content Provider or home MP3 player and a number of potential listeners for example TV sets which may exist in several rooms In addition...

Page 30: ...e clock master by automatic resolution using a Best Master Clock Algorithm BMCA All other devices resolve to be slaves Using the P802 1AS PTP all slave devices will regularly update their own RTC to m...

Page 31: ...V traffic port In this case the Ethernet AVB Endpoint will not prioritize SR Class A Ethernet frames over SR Class B Ethernet frames instead it will apply the credit based shaper algorithm to all of t...

Page 32: ...P802 1Qat specification because this is a pure software task This software is not provided by the Ethernet AVB Endpoint core Typical Implementation Figure 3 2 illustrates a typical implementation for...

Page 33: ...bandwidth restrictions 2 The legacy traffic interface is maintained for best effort ethernet data Ethernet as we know it today for example the PC surfing the internet in Figure 3 1 Wherever possible p...

Page 34: ...34 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Chapter 3 Overview of Ethernet Audio Video Bridging...

Page 35: ...cal User Interface GUI for defining parameters and options For help starting and using the CORE Generator software see the documentation supplied with the ISE software including the CORE Generator Use...

Page 36: ...he core is designed to interface to the LogiCORE IP Tri Mode Ethernet MAC or the LogiCORE IP Embedded Tri Mode Ethernet MAC wrappers available in selected Virtex families See Chapter 12 System Integra...

Page 37: ...net AVB Endpoint core is a PLB slave On the connected PLB there may be several PLB Masters Each slave must uniquely acknowledge individual masters using unique PLB signals during transactions For this...

Page 38: ...ntation Subdirectories containing an HDL example design Scripts to run the core through the back end tools and to simulate the core using Mentor Graphics ModelSim v6 5c Cadence Incisive Enterprise Sim...

Page 39: ...luding previous versions of this core and all other Ethernet LogiCORE IP solutions When generated in this format the core is designed to interface to the LogiCORE IP Tri Mode Ethernet MAC or the LogiC...

Page 40: ...s the MAC to be fully configured via the PLB Interface of the Ethernet AVB Endpoint core The core provides two independent full duplex interfaces for customer logic the AV Traffic Interface and the Le...

Page 41: ...is connected directly to the xps_ll_temac this allows the xps_ll_temac core to source and sink legacy frame data such as TCP IP protocol traffic The full duplex AV Traffic Interface remains for connec...

Page 42: ...ee Chapter 10 Configuration and Status for more information AV Traffic Interface The AV traffic interface provides a dedicated full duplex port for the high priority AV data See Chapter 6 Ethernet AVB...

Page 43: ...ork can be of three types Precise Timing Protocol PTP Packets Routed to the dedicated hardware Rx PTP Packet Buffers which can be accessed by the Software Drivers PTP packets are identified by searchi...

Page 44: ...current nanosecond value of the local RTC is taken This timestamp value is written into a dedicated field within the Tx PTP Packet Buffer where it is accessible along side the content of the PTP fram...

Page 45: ...8576 1 220 fraction of one nanosecond For this reason the RTC increment rate can be adjusted to a very fine degree of accuracy This provides the following features The RTC can be incremented from any...

Page 46: ...master This is achieved in part by receiving the PTP frames transmitted across the network by the clock master and containing the masters sampled RTC value The PTP mechanism will also track the total...

Page 47: ..._clk_en Input A clock enable signal this must be used as a qualifier for tx_clk rx_clk Input The MAC receiver clock provided by the Tri Mode Ethernet MAC rx_clk_en Input A clock enable signal this mus...

Page 48: ...client All signals are synchronous to the MAC receiver clock rx_clk which must be qualified by the corresponding clock enable rx_clk_en see Clocks and Resets Table 5 2 Legacy Traffic Signals Transmit...

Page 49: ...d for the PTP or AV traffic channel legacy_rx_filter_match 7 0 Output This output is only present when the MAC Header Filters are present when the core is generated in Standard CORE Generator Format W...

Page 50: ...net MAC signals and are synchronous to tx_clk Table 5 5 AV Traffic Signals Receiver Path Signal Direction Description av_rx_data 7 0 Output AV frame data received is supplied on this port av_rx_valid...

Page 51: ...d on this port rx_data_valid Input Control signal for the rx_data 7 0 port rx_frame_good Input Asserted at the end of frame reception to indicate that the frame should be processed by the Ethernet AVB...

Page 52: ...different peripheral bus widths The general philosophy of the Ethernet AVB Endpoint core has been to implement a PLB interface which is as simple as possible The following features are provided 32 bit...

Page 53: ...Input Unused PLB secondary to primary read request indicator PLB_wrPrim Input Unused PLB secondary to primary write request indicator PLB_masterID 0 log2 NUM_MASTERS Input PLB current master identifi...

Page 54: ...rite transfer complete indicator Sl_WrBTerm Output Slave terminate write burst transfer Sl_rdBus 0 31 Output Slave read data bus Sl_rdWdAddr 0 3 Output Slave read word address Sl_rdDAck Output Slave r...

Page 55: ...s recommended that these interrupts are routed to the input of an EDK Interrupt Controller module as part of the embedded processor subsystem Table 5 10 Interrupt Signals Signal Direction Description...

Page 56: ...ield used in the 1722 presentation time stamp logic Table 5 11 PTP Signals Signal Direction Description rtc_nanosec_field 31 0 Output This is the synchronized nanoseconds field from the RTC rtc_sec_fi...

Page 57: ...the core Tx Legacy Traffic I F The signals forming the Tx Legacy Traffic I F are defined in Table 5 2 All signals are synchronous to the Tri Mode Ethernet MAC transmitter clock tx_clk which must alway...

Page 58: ...erts a logic 1 onto legacy_tx_data_valid After the Ethernet AVB Endpoint core reads the first byte of data it asserts the legacy_tx_ack signal On the next and subsequent rising clock edges the client...

Page 59: ...are defined in Table 5 4 All signals are synchronous to the Tri Mode Ethernet MAC transmitter clock tx_clk which must always be qualified by the corresponding clock enable tx_clk_en see Table 5 1 See...

Page 60: ...t frame and the frame transmission cycle of Figure 6 3 repeats However if no further AV traffic frames are queued the av_tx_done signal should be set to logic 1 immediately following the end of frame...

Page 61: ...traffic having a higher priority than the legacy traffic there is always remaining bandwidth available to schedule legacy traffic The relevant configuration registers for programming the bandwidth per...

Page 62: ...raffic is queued any positive credit will be lost and the credit is reset to 0 When AV traffic is queued and until the time at which the Tx Arbiter is able to schedule it while waiting for an in progr...

Page 63: ...configuration register settings are described in general and then from the point of view of a single example which describes the calculations made to set the register default values This example dedi...

Page 64: ...frames an Envelope frame as defined in IEEE802 3 can be of size 2000 bytes In this example dedicating up to 75 of the total bandwidth to the AV traffic we obtain hiLimitValue 2000 x 6144 12288000 loL...

Page 65: ...Legacy Traffic I F The signals forming the Rx Legacy Traffic I F are defined in Table 5 3 All signals are synchronous to the Tri Mode Ethernet MAC receiver clock rx_clk which must always be qualified...

Page 66: ...g within the core to allow for latency in the receive client After frame reception begins data is transferred on consecutive clock enabled cycles to the receive client until the frame is complete The...

Page 67: ...trated in Figure 5 1 These have a greater flexibility than the standard address filter provided in the Tri Mode Ethernet MAC which must be disabled The MAC Header Filters include the ability to filter...

Page 68: ...ligned with the legacy_rx_data_valid signal during frame reception Every bit within the legacy_rx_filter_match 7 0 bus will be asserted for frame reception in which the Frame Destination Address DA co...

Page 69: ...compared to the initial 128 bits received in the Legacy Ethernet frame bit 0 is the first bit within the frame to be received Match Enable Register Each bit within this register refers to the same bit...

Page 70: ...initial 48 bits of the received frame must exactly match the first 48 bits of the Match Pattern Register This example provides backwards compatibility with the Address Filters provided in the Tri Mod...

Page 71: ...29 bits as used in this example of the received frame must exactly match the first 29 bits of the Match Pattern Register This functionality is useful for filtering across Multicast group Addresses X R...

Page 72: ...the ability to filter across any bitwise match don t care pattern of the initial 128 bits of an Ethernet frame match combinations of Destination Address Length Type Field when no VLAN tag is present V...

Page 73: ..._ prefix Error Free AV Traffic Reception Figure 7 7 illustrates the timing of a normal inbound frame transfer The AV client must be prepared to accept data at any time there is no buffering within the...

Page 74: ...in which the av_rx_frame_bad is asserted in place of av_rx_frame_good indicates that this frame must be discarded by the AV client it was either received with errors or was not intended for the AV tra...

Page 75: ...n The RTC is effectively a large counter which consists of a 32 bit nanoseconds field the unit of this field is 1 nanosecond and this field will count the duration of exactly one second then reset bac...

Page 76: ...the smoother will be the overall RTC increment rate Xilinx recommends clocking the RTC logic at 125 MHz because this is a readily available clock source obtained from the transmit clock source of the...

Page 77: ...d as illustrated The nanoseconds and sub nanoseconds fields can be considered to be concatenated together All RTC logic within the core is synchronous to the RTC Reference Clock rtc_clk X Ref Target F...

Page 78: ...een reserved for the Increment Value the upper 6 bits of which overlap into the nanoseconds field For this reason the largest per cycle increment 1ns 2 6 64 ns The lowest clock period which is expecte...

Page 79: ...for PTP messages This time stamping of packets is a key element of the tight timing synchronization across the AVB network wide RTC and these samples must be performed in hardware for accuracy The har...

Page 80: ...ce the GMII exists only as an internal connection within the embedded block Therefore by sampling on the client interface we enable the Ethernet AVB Endpoint core to be connected to ANY Xilinx Tri Mod...

Page 81: ...722 specification defines the avbtp_timestamp field This is derived by sampling the IEEE802 1 AS Real Time Clock and converting the low order time to nanoseconds From version 2 1 onwards this conversi...

Page 82: ...82 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Chapter 8 Real Time Clock and Time Stamping...

Page 83: ...The Tx PTP Packet Buffer is divided into eight identical buffer sections as illustrated Each section contains 256 bytes which are formatted as follows the first byte at address zero contains a frame...

Page 84: ...TP frames have been sent and which are still queued Following transmission completion of each requested PTP frame a dedicated interrupt signal interrupt_ptp_tx will be generated by the core On the ass...

Page 85: ...rgest PTP frame Should an illegally oversized PTP frame be received the first 252 bytes will be captured and stored other bytes will be lost The top four addresses of each buffer from address 0xFC to...

Page 86: ...packet information X Ref Target Figure 9 2 Figure 9 2 Rx PTP Packet Buffer Rx PTP Packet Buffers Buffer Number Buffer Base Address 0 1 2 3 4 5 6 7 0x0000 0x0100 0x0200 0x0300 0x0400 0x0500 0x0600 0x0...

Page 87: ...the following information is provided for reference only See the EDK documentation for further information The PLB interface defined by IBM can be complex and support many usage modes such as multipl...

Page 88: ...arget Figure 10 1 Figure 10 1 Single Read Transaction PLB_RNW PLB_BE 0 7 PLB_size 0 3 PLB_type 0 2 PLB_abort PLB_ABus 0 31 PLB_PAValid SI_wait SI_addrAck PLB_wrDBus 0 31 SI_wrDAck SI_wrComp PLB_wrBurs...

Page 89: ...cycle by asserting Sl_wait and delaying Sl_addrAck Wait states can be inserted in the Write sample by delaying the assertion of Sl_wrDAck X Ref Target Figure 10 2 Figure 10 2 Single Write Transaction...

Page 90: ...e space each unique PLB address value references a single byte of data The variable PLB_base_address shown in Figure 10 3 and in the tables that follow represent the starting base address of the AVB c...

Page 91: ...ated in Standard CORE Generator Format X Ref Target Figure 10 3 Figure 10 3 PLB Address Space of the Ethernet AVB Endpoint Core and Connected Tri Mode Ethernet MAC 0x0000 0x1800 0x1000 0x2800 0x2000 0...

Page 92: ...fer Control Register PLB_base_address 0x2000 Bit no Default Access Description 7 0 0 WO tx_send_frame bits The Tx PTP Packet Buffer is split into 8 regions of 256 bytes Each of these can contain a sep...

Page 93: ...P packet 31 12 0 RO Unused Note A read or a write to this register clears the interrupt_ptp_rx interrupt asserted after each successful PTP packet reception Table 10 3 Rx Filtering Control Register PL...

Page 94: ...r for the nanoseconds field of the Real Time Clock used to force step changes into the counter When in PTP clock master mode this can be used to set the initial value following power up When in PTP cl...

Page 95: ...this increment register is very fine in units of 1 1048576 1 220 fraction of one nanosecond Therefore the RTC increment rate can be adjusted to a very fine degree of accuracy This provides the follow...

Page 96: ...is sampled RTC Interrupt Clear Register Table 10 13 describes the control register defined for the interrupt_ptp_timer signal the periodic interrupt signal which is raised by the Real Time Clock Tabl...

Page 97: ...hin the Ethernet AVB Endpoint core A single bit can be written to in a single CPU transaction in order to reset just that particular function several to all bits can be written to in a single CPU tran...

Page 98: ...O PTP Receiver logic reset When written with a 1 forces the PTP receiver logic of the core to be reset This is a subset of the full receiver path reset of bit 1 This reset does not affect PTP receiver...

Page 99: ...bits in this register and all bits in the Match Pattern Ethernet frame bits 32 to 63 register For each bit logic 1 enables the match the corresponding bit in the Match Pattern will be compared logic...

Page 100: ...er Guide UG170 for additional descriptions of these registers MAC Address Filter Registers The Address Filter optionally present in the Tri Mode Ethernet MAC LogiCORE IP solution must not used Instead...

Page 101: ...s an MDIO register via the Ethernet MAC construct the address as follows MDIO register address PLB_base_address 0x6000 MDIO_ADDRESS 8 where MDIO_ADDRESS is a 10 bit binary address constructed from the...

Page 102: ...102 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Chapter 10 Configuration and Status...

Page 103: ...6 devices 2 for Spartan 6 devices 4 for all Spartan 3 devices I O Location Constraints No specific I O location constraints are required Placement Constraints No specific placement constraints are re...

Page 104: ...lk or ref_clk then this constraint is unnecessary and can be removed The maximum supported frequency of host_clk as specified by the Tri Mode Ethernet MAC core is 125 MHz The following UCF syntax show...

Page 105: ...ectly on the new clock domain many constraints are required and must not be removed These constraints are also present in the example design UCF delivered with the core Clock Domain Crossing Constrain...

Page 106: ...toggle TO rx_clear_toggle_resync TIG INST top ptp_packet_buffer_inst rx_ptp_packet_buffer_inst rx_mac_logic_in st address TNM FFS rx_buf_addr INST top ptp_packet_buffer_inst rx_ptp_packet_buffer_inst...

Page 107: ...avb_configuration_inst tx_cpu_reclock rd_toggle TNM FFS tx_rd_toggle INST top avb_configuration_inst tx_cpu_reclock resync_read_toggle data_sy nc TNM FFS resync_tx_read_toggle TIMESPEC ts_tx_rd_toggl...

Page 108: ...TIG INST top rtc_inst rtc_configuration_inst rtc_cpu_reclock rd_toggle TNM FFS rtc_rd_toggle INST top rtc_inst rtc_configuration_inst rtc_cpu_reclock resync_read_togg le data_sync TNM FFS resync_rtc_r...

Page 109: ...c_set_toggle TIMESPEC ts_pulse1div128sec_toggle FROM pulse1div128sec_toggle TO resync_set_toggle 8 ns DATAPATHONLY clock domain crossing constraints for MAC Host I F Logic INST top generic_host_if_ins...

Page 110: ...INST top generic_host_if_inst resync_host_toggle data_sync TNM FFS resync_host_toggle TIMESPEC ts_host_toggle FROM host_toggle TO resync_host_toggle 8 ns DATAPATHONLY INST top generic_host_if_inst ho...

Page 111: ...o the Xilinx Embedded Development Kit EDK environment When generated in this format the core is designed to interface to the XPS LocalLink Tri Mode Ethernet MAC xps_ll_temac Refer to Using the Xilinx...

Page 112: ...t MAC Soft Core Tri Mode Ethernet MAC Core Generation When generating the Tri Mode Ethernet MAC TEMAC core in the CORE Generator software be sure that the following options are selected Management Int...

Page 113: ...re 12 1 Figure 12 1 Connection to the Tri Mode Ethernet MAC Core without Ethernet Statistics tx_clk tx_clk_en tx_data 7 0 rx_clk rx_clk_en rx_data 7 0 rx_data_valid rx_frame_good rx_frame_bad host_opc...

Page 114: ...nable as used with the TEMAC must always be connected to the tx_clk_en input of the Ethernet AVB Endpoint core The Ethernet receiver client clock domain must always be connected to the rx_clk input of...

Page 115: ...ure 12 2 Figure 12 2 Connection to the Tri Mode Ethernet MAC and Ethernet Statistic Cores tx_clk tx_clk_en tx_data 7 0 rx_clk rx_clk_en rx_data 7 0 rx_frame_good rx_frame_bad host_opcode 1 0 host_addr...

Page 116: ...C in the CORE Generator software be sure that the following options are selected Enable EMACs Enable only a single EMAC from the pair at this time Host Type Select Host Speed Select Tri speed Global B...

Page 117: ...x_clk_en tx_data 7 0 rx_clk rx_clk_en rx_data 7 0 rx_data_valid rx_frame_good rx_frame_bad host_opcode 1 0 host_addr 9 0 host_wr_data 31 0 host_req host_miim_sel host_miim_rdy host_rd_data_mac 31 0 ho...

Page 118: ...rx_data_valid host_opcode 1 0 host_addr 9 0 host_wr_data 31 0 host_req host_miim_sel host_miim_rdy host_rd_data_mac 31 0 hos_rd_data_stats 31 0 host_clk CLIENTEMAC0PAUSEREQ CLIENTEMAC0PAUSEVAL 15 0 TX...

Page 119: ...MAC connect host_rd_data_stats 31 0 of the Ethernet AVB Endpoint core to the host_rd_data 31 0 port of the Ethernet Statistics core Virtex 6 FPGA Embedded Tri Mode Ethernet MAC The Ethernet AVB Endpoi...

Page 120: ...onnection of the Ethernet AVB Endpoint Core into an Embedded Processor Sub system Microblaze BRAM xps_intc xps_uartlite lmb_bram_if_cntlr Ethernet AVB Endpoint TEMAC Custom AV logic Custom Legacy logi...

Page 121: ...tom logic blocks must be manually translated into pcores using the standard pcore approach described in Xilinx Platform Studio documentation The standard EDK flow can then be implemented to build the...

Page 122: ...the AVB software drivers can be assigned to this instance in the Microprocessor Software Specification mss file Using an ISE Software Top Level Project X Ref Target Figure 12 7 Figure 12 7 Connection...

Page 123: ...e EDK tool set The main advantages of this implementation hierarchy are in terms of possible faster development turn around for synthesis implementation run time This is as a result that the EDK compo...

Page 124: ...oduct or an Embedded Tri Mode Ethernet MAC available in certain Virtex devices The xps_ll_temac functionality remains identical for either MAC implementation The integration of the Ethernet AVB Endpoi...

Page 125: ...ction of the Ethernet AVB Endpoint Core into an Embedded Processor Sub system Microblaze BRAM xps_intc xps_uartlite lmb_bram_if_cntlr Ethernet AVB Endpoint XPS_LL_TEMAC Custom AV logic PLB PLB AV traf...

Page 126: ...mbedded processor should be configured to use the software drivers provided with the core see Chapter 13 Software Drivers Ethernet AVB Endpoint Connections Figure 12 8 illustrates the overall connecti...

Page 127: ...tion X Ref Target Figure 12 9 Figure 12 9 Connection to the XPS LocalLink Tri Mode Ethernet MAC tx_clk tx_clk_enable tx_data 7 0 rx_clk rx_clk_enable rx_data 7 0 rx_data_valid rx_frame_good rx_frame_b...

Page 128: ..._GMII_TX_CLK_0_pin PORT GMII_RXD_0 fpga_0_Hard_Ethernet_MAC_GMII_RXD_0_pin PORT GMII_RX_DV_0 fpga_0_Hard_Ethernet_MAC_GMII_RX_DV_0_pin PORT GMII_RX_ER_0 fpga_0_Hard_Ethernet_MAC_GMII_RX_ER_0_pin PORT...

Page 129: ...Mac02AvbRxFrameBad PORT legacy_tx_data Temac02AvbTxData PORT legacy_tx_data_valid Temac02AvbTxDataValid PORT legacy_tx_underrun Temac02AvbTxUnderrun PORT legacy_tx_ack Avb2Temac0TxAck PORT legacy_rx_...

Page 130: ...then use the AVB feature in a processor based system AXI_Ethernet Configuration To ensure that AVB Audio Video frames can be sent received the AXI Ethernet MAC should be configured via software initi...

Page 131: ...he comments can be viewed by Doxygen and detailed descriptions of all aspects of the software are available throughout the code This should allow customers to fully understand the operation of the pro...

Page 132: ...ges Software System Integration The software drivers for the Ethernet AVB Endpoint core need to be run on an embedded processor In addition they require instantiation into the overall software project...

Page 133: ...nt core generation When the core has been generated in the EDK pcore format the value of the PLB base address will be automatically configured by XPS Interrupt Service Routine Connections The Ethernet...

Page 134: ...XAVB_MAC_TX_ENABLE_MASK XAVB_MAC_TX_VLAN_ENABLE_MASK Ethernet AVB Endpoint Setup This section describes the main elements that you may have to modify in order to operate the Ethernet AVB Endpoint soft...

Page 135: ..._SOURCE_ADDRESS_EUI48_LOW 0xCCBBAA You can edit the defines above to be the Ethernet Source Address for the device and the example software then provides code that translates this address into an XAvb...

Page 136: ...initialization is for the AVB drivers to be inactive After the Ethernet link has been established the drivers can be started using the following function call This will begin operation of the IEEE802...

Page 137: ...sing the provided demonstration test bench For detailed information about the Standard CORE Generator example design see Chapter 15 Detailed Example Design Standard Format For detailed information abo...

Page 138: ...Mentor Graphics ModelSim v 6 5c and Synopsys VCS and VCS MX 2009 12 X Ref Target Figure 14 1 Figure 14 1 Ethernet AVB Endpoint Example Design and Test Bench Example Design Top Level Ethernet AVB Endp...

Page 139: ...tware_manuals htm 2 Create a new project 3 For project options select the following A Virtex 6 Virtex 5 Spartan 3 Spartan 3E Spartan 3A 3A DSP or Spartan 6 device to generate the default Ethernet AVB...

Page 140: ...s on GUI page 1 so that Standard CORE Generator format is selected 9 Click Generate to deliver the core using the default options The default core and its supporting files including the example design...

Page 141: ...Libraries compiled for your system See the Compiling Xilinx Simulation Libraries COMPXLIB in the Xilinx ISE Synthesis and Verification Design Guide and the Xilinx ISE Software Manuals and Help You can...

Page 142: ...ulate_vcs sh Verilog only The simulator script compiles the gate level model and the demonstration test bench adds relevant signals to a wave window and then runs the simulation to completion You can...

Page 143: ...nx CORE Generator software the purpose and contents of the provided scripts the contents of the example HDL wrappers and the operation of the demonstration test bench Please refer to Chapter 16 Detail...

Page 144: ...ollowing tables project directory The project directory contains all the CORE Generator software project files Table 15 1 Project Directory Name Description project_dir component_name ngc Top level ne...

Page 145: ...Directory Name Description project_dir component_name doc eth_avb_endpoint_ds677 pdf Ethernet AVB Endpoint Data Sheet eth_avb_endpoint_ug492 pdf Ethernet AVB Endpoint User Guide Back to Top Table 15...

Page 146: ...ssor is required in a real system which provides stimulus to the PLB performing write and reads that initiate PTP frame transmission Back to Top Table 15 4 Example Design Directory Cont d Name Descrip...

Page 147: ...notated SimPrim based model used for timing simulation routed sdf Timing information for simulation Back to Top Table 15 7 Simulation Directory Name Description project_dir component_name simulation d...

Page 148: ...Description Table 15 9 Timing Directory Name Description project_dir component_name simulation timing simulate_mti do ModelSim macro file that compiles Verilog or VHDL sources and runs the timing simu...

Page 149: ...form Studio drivers avb_v2_04_a examples The driver examples directory contains an application example using the low level driver files Table 15 10 Driver Data Directory Name Description project_dir c...

Page 150: ...es required per single instance of the device driver xavb c Provides the top level function calls for the Ethernet AVB Endpoint level 1 device driver xavb_ptp_packets c Provides the functions which ar...

Page 151: ...sis is performed on the routed design using trce 6 A bitstream is generated 7 Netgen runs on the routed design to generate a VHDL or Verilog netlist as appropriate for the Design Entry project setting...

Page 152: ...ates the complete example design for the Ethernet AVB Endpoint Individual sub blocks are described in the following sections Note The example design is designed to allow the core in isolation to be te...

Page 153: ...gacy frames transmitted are then looped back and received at the corresponding AV and Legacy receive client interfaces Two instances of an Ethernet Frame Checker block configured differently and conne...

Page 154: ...ted frame are defined by generics Destination Address Source Address Length Type the VLAN field is optional Additionally the expected length of the Ethernet frame can also be set using a parameter The...

Page 155: ...it then requests a follow up frame to be sent For any other PTP frame type no action is taken Reading from the PTP Tx Control Status register clears the interrupt PTP Receive Interrupt Service Routin...

Page 156: ...ains the following The number of PTP frames transmitted and received The number of AV frames transmitted and received The number of legacy frames transmitted and received All transmitted frame statist...

Page 157: ...llows a Functional Simulation to immediately use the new settings However because these modifications require logical changes the Implementation Scripts must be re run on the design before running a T...

Page 158: ...d the wave window section headings are also numbered to match Figure 15 3 Further signals of interest may be added as desired The signals added to the Timing Simulation are a subset of the ones used i...

Page 159: ...user defined project directory component name Core release notes file component name doc Product documentation MyProcessorIPLib pcores eth_avb_endpoint_v2_04_a core netlist and HDL for the pcore pcor...

Page 160: ...minute changes and updates Table 16 1 Project Directory Name Description project_dir component_name ngc Top level netlist This is instantiated by the Verilog or VHDL example design component_name xco...

Page 161: ...The driver data directory contains the data files for automatic integration into Platform Studio Table 16 3 Doc Directory Name Description project_dir component_name doc eth_avb_endpoint_ds677 pdf Eth...

Page 162: ...rectory containing the software device drivers for the Ethernet AVB Endpoint core and associated supporting files Table 16 5 Driver Data Directory Name Description project_dir component_name MyProcess...

Page 163: ...ion example using the low level driver files Table 16 7 Driver Data Directory Name Description project_dir component_name MyProcessorIPLib drivers avb_v2_04 data avb_v2_1_0 mdd Current MDD file used i...

Page 164: ...n values required per single instance of the device driver xavb c Provides the top level function calls for the Ethernet AVB Endpoint level 1 device driver xavb_ptp_packets c Provides the functions wh...

Page 165: ...into the Embedded Development Kit EDK You can import a generated Ethernet AVB Endpoint netlist into an EDK project by following the usual steps to import a black box IP See the Xilinx Platform Studio...

Page 166: ...166 www xilinx com Ethernet AVB Endpoint User Guide UG492 September 21 2010 Chapter 16 Detailed Example Design EDK format...

Page 167: ...a RTC implementation which uses a 40 ns clock period as its clock source this is worst case Therefore the controlled frequency RTC will only be updated every 40ns Because the concept of a RTC is a co...

Page 168: ...tamp sample is equal to the period of the RTC reference clock in this example 40 ns By using a high frequency RTC reference clock a high degree of accuracy can be obtained X Ref Target Figure A 1 Figu...

Page 169: ...clock to the RTC reference clock domain When in the RTC clock domain the toggle signal is re clocked using the two synchronization flip flops illustrated After this an edge detection circuit is used t...

Page 170: ...Accuracy X Ref Target Figure A 3 Figure A 3 Sampling Position Uncertainty TIMING CASE 1 MAC Tx Rx clock toggle RTC Reference Clock Q0 Q1 Q2 Take RTC Sample clock boundary MAC Tx Rx clock toggle RTC Re...

Page 171: ...ows that the accuracy is variable For example The request for the 1st time stamp is made at 60 ns Because the time to the next RTC reference clock is 20 ns this will not violate the setup time for the...

Page 172: ...The RTC is sampled 1 RTC reference clock period later as 240 resulting in an error of only 1 ns Hopefully these examples have illustrated that the timing uncertainty in the asynchronous sampling circu...

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