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PLB PCI Full Bridge (v1.00a)

DS508 March 21, 2006

www.xilinx.com

Product Specification

EAR

ACCESS

default in all transfers. Address translation is performed by high-order bit substitution.
High-order bit definition is defined only by parameters

• Registers include

- Interrupt and interrupt enable registers at different hierarchal levels

- Reset

- Configuration Address Port, Configuration Data Port and Bus Number/Subordinate Bus

Number

- High-order bits for PLB to PCI address translation

- Bridge Device number on PCI bus

• PLB-side Interrupts include

- PLB Master Read SERR and PERR

- PLB Master Read Target Abort

- PLB Master Write SERR and PERR

- PLB Master Write Target Abort

- PLB Master Write Master Abort

- PLB Master Burst Write Retry and Retry Disconnect

- PLB Master Burst Write Retry Timeout

- PCI Initiator Read and Write SERR

• Asynchronous FIFOs with backup capability

• Synchronization circuits for signals that cross time-domain boundaries

• Responds to the PCI latency timer

• Completes posted write operations prior to initiating new operations

• Signal set required for integrating a PCI bus arbiter in the FPGA with the PLB PCI bridge is

available at the top-level of the PLB PCI bridge module. The signal set includes PCLK, RST_N,
FRAME_I, REQ_N_toArb and IRDY_I

• Supports PCI clock generated in FPGA

• Parameterized control of IO-buffer insertion of INTR_A and REQ_N IO-buffers

• All address translations performed by high-order bit substitution. The number of bits substituted

depends on the address range

- Parameterized selection of IPIF BAR high-order bits defined by programmable registers for

dynamic translation operation or by parameters for reduced resource utilization

• Parameterized selection of device ID number (when configuration functionality is included)

defined by a programmable register for dynamic device number definition or by parameter to
reduce resource utilization

• The PLB PCI bridge does not have an integral DMA

• Input signal to provide the means to asynchronous asset INTR_A from a user supplied register (i.e.,

a PLB GPIO). The signal is Bus2PCI_INTR is an active high signal

• PCI Monitor output port to monitor PCI bus activity

Содержание LogiCore PLB PCI Full Bridge

Страница 1: ...ribed in the 64 Bit Processor Local Bus Architecture Specification v3 5 Details on the Xilinx PLB and the PLB IPIF are found in the Processor IP Reference Guide This guide is accessed via EDK help or...

Страница 2: ...t be used to access memory on the PLB side Configuration read and writes are supported including self configuration transactions only when upper word address lines are utilized for IDSEL lines The Con...

Страница 3: ...er Completes posted write operations prior to initiating new operations Signal set required for integrating a PCI bus arbiter in the FPGA with the PLB PCI bridge is available at the top level of the P...

Страница 4: ...cal Bus Intellectual Property InterFace It interfaces to the PLB bus The IPIF v3 0 Bridge It interfaces between the PLB IPIF and the v3 0 core The LogiCORE PCI32 Interface v3 0 core It interfaces to t...

Страница 5: ...or Only PCI memory space is supported Address translations in both directions are performed as follows High order address bits are substituted for the address vector before crossing to the other bus d...

Страница 6: ...igh order bit sub Addr to PCI IPIFBAR_2 PCIBAR_2 ds508_02_112205 Example 1 Because address translations are performed only when the PLB PCI Bridge is configured with FIFOs the example shown in Figure...

Страница 7: ...ds 0x56710ABC on the PCI bus Accessing the PLB PCI Bridge IPIFBAR_1 with address 0xABCDF123 on the PLB bus yields 0xFEDC1123 on the PCI bus Accessing the PLB PCI Bridge IPIFBAR_2 with address 0xFFFEDC...

Страница 8: ...or G4 PCI BAR to which IPIF BAR 0 is mapped unless C_INCLUDE_BAROFF SET_REG 1 C_IPIFBAR2 PCIBAR_0 1 Vector of length C_PLB_AWIDTH 0xFFFFFFFF std_logic_ vector G5 IPIF BAR 0 memory designator C_IPIF_SP...

Страница 9: ...F BAR 4 is mapped unless C_INCLUDE_BAROFF SET_REG 1 C_IPIFBAR2 PCIBAR_4 Vector of length C_PLB_AWIDTH 0xFFFFFFFF std_logic_ vector G21 IPIF BAR 4 memory designator C_IPIF_SPACE TYPE_4 0 I O space 1 Me...

Страница 10: ...ta bus width C_PCI_DBUS_ WIDTH 32 32 integer G35 Both PCI2IPIF FIFO address bus widths Usable depth is 2 C_PCI2IPIF_FIFO_A BUS_WIDTH 3 C_PCI2IPIF_ FIFO_ABUS_ WIDTH 4 14 9 integer G36 Both IPIF2PCI FIF...

Страница 11: ...CI FIFO DEPTH 3 IPIF2PCI FIFO DEPH given by 2 C_IPIF2PCI_FIFO_ ABUS_WIDTH 16 integer G43 Number of PCI retry attempts in IPIF posted write operations C_NUM_PCI_R ETRIES_IN_ WRITES Any integer 3 intege...

Страница 12: ...PCI Configuration Space Header Device ID C_DEVICE_ID 16 bit vector 0x0000 std_logic_ vector G54 PCI Configuration Space Header Vendor ID C_VENDOR_ ID 16 bit vector 0x0000 std_logic_ vector G55 PCI Con...

Страница 13: ...Number of masters on PLB bus set automatically by XPS C_PLB_NUM_ MASTERS 1 16 8 integer G66 PLB Address width C_PLB_ AWIDTH 32 only allowed value 32 integer G67 PLB Data width C_PLB_ DWIDTH 64 only a...

Страница 14: ...t PLB Bus I PLB main bus reset See table note 1 P4 PLB_ABus 0 C_PLB_ AWIDTH 1 PLB Bus I Note 1 applies from P4 to P53 P5 PLB_PAValid PLB Bus I P6 PLB_masterID 0 C_PLB _MID_WIDTH 1 PLB Bus I P7 PLB_abo...

Страница 15: ...LB_MRdDAck PLB Bus I P39 PLB_MRdBTerm PLB Bus I P40 PLB_MWrBTerm PLB Bus I P41 M_request PLB Bus O P42 M_priority PLB Bus O P43 M_buslock PLB Bus O P44 M_RNW PLB Bus O P45 M_BE 0 C_PLB_DWIDT H 8 1 PLB...

Страница 16: ...nals P63 INTR_A PCI Bus O Indicates that LogiCORE PCI interface requests an interrupt PCI Error Signals P64 PERR_N PCI Bus I O Indicates that a parity error was detected while the LogiCORE PCI interfa...

Страница 17: ...n INTR_A behavior relative to v3 0 input INTR_N The v3 0 core command register interrupt disable bit controls the INTR_A operation and v3 0 core status register Interrupt status bit flags if v3 0 core...

Страница 18: ...B memory space that is responded to by this device IPIF BAR G4 C_IPIFBAR2PCIBAR_0 G2 G3 and G48 Meaningful only if G48 0 and in this case only high order bits that are the same in G2 and G3 are meanin...

Страница 19: ...4 then G18 to G19 define the range in PLB memory space that is responded to by this device IPIF BAR G19 C_IPIFBAR_HIGHADDR_4 G18 G1 and G18 Meaningful only if G1 4 then G18 to G19 define the range in...

Страница 20: ...gful if G26 1 2 G33 C_PCI_ABUS_WIDTH Only 1 setting G34 C_PCI_DBUS_WIDTH Only 1 setting G35 C_PCI2IPIF_FIFO_ABUS_ WIDTH G36 C_IPIF2PCI_FIFO_ABUS_ WIDTH G37 C_INCLUDE_INTR_A_ BUF P63 If G37 0 an io buf...

Страница 21: ...E_DEVNUM_ REG G63 G61 G62 If G61 0 G49 has no meaning If G49 and G61 1 G63 has no meaning Meaningful bits in the Device Number register are defined by G62 G50 C_NUM_IDELAYCTRL G68 If G68 Virtex 4 G50...

Страница 22: ...as no meaning If G61 1 and G49 0 G63 must be consistent with the setting of G62 IPIF Parameters Group G64 C_PLB_MID_WIDTH G65 C_PLB_NUM_MASTERS G66 C_PLB_AWIDTH G67 C_PLB_DWIDTH G68 C_FAMILY G50 52 If...

Страница 23: ...EADDR 0x04 Read Write Device Interrupt Enable Register IER C_BASEADDR 0x08 Read Write Device Interrupt ID IID C_BASEADDR 0x18 Read Global Interrupt Enable Register GIE C_BASEADDR 0x1C Read Write Bridg...

Страница 24: ...ation Data Port Present only if G61 1 Bus Number Subordinate Bus Number Present only if G61 1 IPIFBAR2PCIBAR_0 High Order Bits Present only if G48 1 IPIFBAR2PCIBAR_1 High Order Bits Present only if G1...

Страница 25: ...e the PLB IPIF Interrupt Product Specification the module is labeled PLB Interrupt module but is used in the PLB IPIF Table 8 Bridge Interrupt Register Bit Definitions Bit Assignment Assumes 32 bit Bu...

Страница 26: ...clear 0x0 PLB Master Read Target Abort Interrupt 29 indicates that a target abort was detected by the v3 0 core when performing as a PCI initiator reading data from a PCI target 30 PLB Master Read PER...

Страница 27: ...0 Not enabled 1 Enabled 26 PLB Master Write Target Abort Read Write 0x0 PLB Master Write Target Abort Enable Enables this interrupt to be passed to the interrupt controller 0 Not enabled 1 Enabled 27...

Страница 28: ...Bus 1 256 24 D24 Read Write 0x0 Active high enable bit 25 31 D25 D31 Read 0x0 Reserved and hardwired to 0 Configuration Data Port Register Description The Configuration Data Port Register exists only...

Страница 29: ...he low order bits hard wired to zero The IPIFBAR2PCIBAR_N registers are included in the bridge via the parameter C_INCLUDE_BAROFFSET_REG These read write registers allow dynamic run time changes of th...

Страница 30: ...e translation to PCI memory and IO space For the previous example the following registers are set Register for C_IPIFBAR_0 IPIFBAR2PCIBAR_0 High Order Bit Register Programmable register for 16 high or...

Страница 31: ...Device Number register is included by setting C_INCLUDE_DEVNUM_REG 1 The register can be included only if configuration functionality is included i e C_INCLUDE_PCI_CONFIG 1 This register is read writ...

Страница 32: ...en the IPIF is operating as a PLB slave it performs single transfers of 1 8 bytes burst transfers of any number of double words and 4 8 or 16 word line transactions The IPIF always performs line read...

Страница 33: ...t Supported Write Burst transfer double word I O Write Memory Write multiple data phase Not Supported Sequential fill 4 8 and 16 word cacheline write 2 I O Write Memory Write multiple data phase Not S...

Страница 34: ...r insertion of wait states prior to the first data transfer Consequently if the PLB device requires throttling that affects the PCI transaction the PLB PCI Bridge must terminate the transaction If the...

Страница 35: ...LB transaction will be terminated When the PLB master terminates the transaction with data remaining in the FIFO the FIFO is flushed Because the data is required to be prefetchable data is not lost wh...

Страница 36: ...PCI transaction is attempted as long as the PLB master request is active If a retry is issued on a subsequent PCI transfer and the PLB master is requesting more data an automatic retry is issued when...

Страница 37: ...d The bridge inhibits IPIF timeout while trying to get the requested data Target disconnect with data Completes PERR Data is transferred and the PLB Master Read PERR interrupt asserted Data transfer t...

Страница 38: ...s the actual depth minus 3 words Data is loaded in the FIFO on each clock cycle that the write request is asserted and the address decode is valid If the transaction is not a burst i e PLB_wrBurst is...

Страница 39: ...ite Retry interrupts Consistent with the PCI Spec the PLB master is required to perform the write again if the last of the automatic retries was terminated with a PCI retry If on a single transfer the...

Страница 40: ...I target the bridge is available for a new write transaction Table 18 summarizes the abnormal conditions that a PCI target can respond with and how the response is translated to the PLB master Table 1...

Страница 41: ...he PLB is double word aligned Every memory read multiple command that translates to a burst read operation is performed with the full 64 bits on the PLB independent of the byte enable specified by the...

Страница 42: ...B PCI Bridge must disconnect with data because the v3 0 core does not allow throttling after the first data phase Throttling by the PLB slave and the v3 0 restriction of not allowing throttling of dat...

Страница 43: ...a read multiple command is performed and a PLB rearbitrate is asserted by the PLB slave on the first request for data the PLB PCI Bridge commands the v3 0 core to disconnect without data i e PCI retry...

Страница 44: ...st be memory space in the PCI sense the memory write command is the only write command from a remote PCI initiator to which the PLB PCI Bridge will respond The command decode and number words written...

Страница 45: ...ter abort will occur see v3 0 core documentation If enabled the v3 0 core asserts SERR_N when address phase parity errors are detected If SERR_N is asserted by a remote agent in a data phase the bridg...

Страница 46: ...s near the end of the valid range Table 20 summarizes most abnormal conditions that a PLB slave can respond with to a memory write command and how the response is translated to the PCI initiator Table...

Страница 47: ...ctionality in the Command Status Register and sets the latency timer to maximum count for most any data value written to the registers This behavior is an artifact of the v3 0 core behavior Configurat...

Страница 48: ...able 22 show examples only and do not show all the possible bit patterns Note that the bytes are swapped for maintaining byte addressing integrity The v3 0 core is PCI 2 2 compliant core but it has PC...

Страница 49: ...e configuration command register of the v3 0 core is not set If a configuration read to a device number not assigned to a device on the PCI bus is attempted a Master Abort occurs on the PCI bus and al...

Страница 50: ...ically retried until the transfer completes Automatically retried a parameterized number of times If the last of the PCI write command retries fail due to a PCI retry the PLB Master Burst Write Retry...

Страница 51: ...is listed in Table 24 Table 24 PCI Bus Monitoring Signals Bit Index Signal Name Instantiated IO Buffer PCI Transaction Control Signals 0 FRAME_N Yes 1 DEVSEL_N Yes 2 TRDY_N Yes 3 IRDY_N Yes 4 STOP_N Y...

Страница 52: ...design data sheet for details Additional bridge specific constraints are required and an example ucf file is provided in the EDK pcores library To remind the user that the additional bridge related co...

Страница 53: ...EDK flow checks if the PCI clock is a PAD input and if it is then the OFFSET constraints shown below are includes in the bridge ngc file Time Specs Important Note The timespecs used in this section c...

Страница 54: ...m the MHS file This allows upgrading to v1 02 a from v1 01 a without changing ports Recall that v1 01 a does not support the Virtex 4 architecture It is required that the 200 MHz clock be stable when...

Страница 55: ...provided The FPGA Editor tool can be helpful to determine IDELAYCTRL LOC coordinates for the user s pinout The syntax for the ucf file LOC constraints is shown in the example below where the instance...

Страница 56: ...can change in with future versions of the tools Virtex 4 Only Constraints INST XPCI_CBD IOBDELAY_TYPE VARIABLE INST XPCI_ADD IOBDELAY_TYPE VARIABLE INST PCI_CORE XPCI_PARD IOBDELAY_TYPE VARIABLE INST...

Страница 57: ...reated that instantiated the PLB PCI bridge with the parameters set as outlined in Table 25 The data is shown for a Virtex II Pro device for Virtex 4 devices and an additional GCLK is required for the...

Страница 58: ...important to understanding the PLB PCI Bridge design Processor IP Reference Guide Xilinx LogiCORE PCI Interface v3 0 Product Specification Xilinx The Real PCI Design Guide v3 0 IPSPECXXX PLB IPIF Log...

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