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BusWorks

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900EN-S005 Ethernet Switch User’s Manual Ethernet I/O

___________________________________________________________________

_______________________________________________________________________________________
Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:

[email protected]

http://www.acromag.com

47

NO

Found

Found

Not
Found

Not
Found

Start

Packet Forwarded Here

Search Complete.

Get PTF1 From
Dynamic Table.

Search Complete.

Get PTF1 From
Static Table.

PTF1=NULL

Resolving Destination
Address Flow Chart

PTF1

PTF2

Search Based
On DA+FID

Port Mirror
Process

Search Based On
DA or DA+FID

VLAN ID
Valid?

Search VLAN Table
Ingress VLAN Filter

Discard NPVID Check

YES

Applied to MAC 1 thru MAC 4.

MAC 5 is reserved for host processor.
IGMP will be forwarded to port 5.

Chk Rx Port Receive Enable Bit
Chk Dest Port Transmit Enable Bit

Chk If Special Packet (BPDU or Specified)

Stage 1
Point-To-Forward 1

Stage 2

Rx Mirror
Tx Mirror
Rx or Tx Mirror
Rx and Tx Mirror

Search Complete.
Get PTF1 From
VLAN Table.

Port VLAN
Membership
Check

Search Dynamic
Table

Search Static
Table

IGMP Process

Spanning Tree
Process

(Not Supported)

Network Time Parameter

10BaseT (10MHz)

100BaseT (100MHz)

Bit Time (BT)

100ns

10ns

Slot Time

512BT (51.2us)

512BT (5.12us)

InterPacket Gap Time

9.6us

0.96us

The internal switch engine will forward packets according to a two stage
algorithm illustrated in the following flow chart. It first looks up the VLAN ID,
static table, and dynamic table for the Destination Address (DA) and
resolves to a “port to forward 1” (PTF1). The PTF1 is then modified by the
spanning tree (not supported), IGMP snooping, port mirroring, and port
VLAN processes to resolve to a “port to forward 2” (PTF2). PTF2 is where
the packet will be sent. Not all of these stages are supported by this model.

The 900EN-S005 will not forward the following packets:

•

Error packets: Framing errors, FCS errors, alignment errors, and

illegal-size packet errors.

•

IEEE 802.3x Pause Frames: The switch will intercept these packets

and perform the appropriate actions.

•

Local Packets (Based on Destination Address Look-up): If the

destination port from the look-up table matches the port where the
packet was from, the packet is defined as a “local packet” and will
not be forwarded.

Inter Packet Gap (IPG)

Switch Forwarding

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Содержание 900EN-S005

Страница 1: ...Port 10 100M Ethernet Switch USER S MANUAL ACROMAG INCORPORATED Tel 248 624 1541 30765 South Wixom Road Fax 248 624 9234 P O BOX 437 Wixom MI 48393 7037 U S A Copyright 2003 Acromag Inc Printed in th...

Страница 2: ...Box DIP Switch Mode 18 EEPROM Mode 19 EEPROM Program Utility keeprom exe 20 EEPROM Register Map 22 SPI Slave Mode 40 TERMS AND CONCEPTS 41 Auto MDI MDI X Crossover 41 Auto Negotiation Auto Sense 42 A...

Страница 3: ...ING OPTIONS REFER TO MANUAL The port status LED indicators are programmable via DIP switches and have two possible display modes that combine indication of speed collision duplex link and activity By...

Страница 4: ...Polarity Automatic Half Full Duplex Automatic 10M 100M Automatic Address Learning Automatic Address Migration Automatic Address Aging using 5 minute period 300 75s Flow Controls Enabled Half Duplex B...

Страница 5: ...al configuration at power up the operation of the port LED s and how the program port interface P1 is to operate Set S2 switches UP to turn them ON and DOWN for OFF Interface Selection Switch Bank 2 S...

Страница 6: ...SET POWER ON ON DIP SWITCHES PUSH BUTTON RESET For an explanation of unfamiliar terms or modes of operation please refer to the Technical Reference section of this manual Socket P1 is located on top o...

Страница 7: ...ult LED Mode 0 Link Activity LED Once auto negotiation has completed the Link Activity LED will be ON to indicate Link status This LED will blink ON OFF intermittently to indicate activity when data i...

Страница 8: ...x channels pairs as required As such a straight through or crossover cable can be used to connect to any port of this device However it is not good practice to use crossover cables when wiring to a sw...

Страница 9: ...T CABLE MDI X AS BOTH THE PC AND THE 9XXEN MODULE ETHERNET PORTS ARE WIRED MDI ETHERNET SWITCHES AND HUBS ARE WIRED MDI X THE ACROMAG ETHERNET SWITCH IS AUTOMATIC MDI MDI X AND ELIMINATES THE NEED FOR...

Страница 10: ...is limited to 100 meters using approved cable Good practice further limits segment length to 80 or 80 meters Network cable may be picking up noise Try using Category 5E shielded cable and shielded RJ...

Страница 11: ...and cabling problems and may also compile Management Information Base MIB data similar to that shown in the table below This table gives additional troubleshooting information for common MIB statisti...

Страница 12: ...t and devices on this segment RxJabbers Stop that incessant jabbering shut up and listen This counts the number of frames larger than the maximum packet size of 1522 bytes or 1536 bytes depending on t...

Страница 13: ...cting the node may be too long it must be less than 100M Otherwise there may be a duplex mismatch between the switch port and the connected node RxCRCerror RxAlignmentError These stats count the numbe...

Страница 14: ...mitting at the same time again but collisions may still occur and this process will repeat itself until the packets finally pass onto the network or the packets may be discarded after 16 consecutive c...

Страница 15: ...us and minus polarities for the differential Tx Rx channel pairs Unmanaged Stand Alone Operation No PC for basic operation Wire Speed Receive and Transmit Non Blocking Switch Allows simultaneous trans...

Страница 16: ...e network distance Switches split networks into separate collision domains at each port Switches provides determinism by reducing collisions Switches increases network bandwidth throughput Switches ca...

Страница 17: ...iated port number up to 1024 MAC addresses are stored in high speed SRAM However until the switch actually learns the port a particular address resides at the first packet it forwards this traffic to...

Страница 18: ...al reserved for factory use The second and third levels also require an optional cable Acromag model 5035 365 and configuration software This section of the manual will explain some of the alternate o...

Страница 19: ...e settings of the other switches as opposed to the settings configured in the corresponding EEPROM registers see Register Map For options not directly addressed by a DIP switch the defaults noted in t...

Страница 20: ...ion The actual data that traverses the serial line changes during the clock low time This interface is compatible with the Atmel AT24C02 EEPROM and further timing and data sequences can be found in th...

Страница 21: ...t takes two hex digits to represent eight register bits Use this table and divide each register into two 4 bit numbers in order to determine what to write to a register Note that any changes you make...

Страница 22: ...tware To write data to the EEPROM registers you will need to refer to the EEPROM Register Map that follows You will have to enter data in byte form using two hexadecimal digits to represent the conten...

Страница 23: ...12 15 0CH 0FH Reserved Do Not Modify 16 29 10H 1DH Port 1 Control Registers 30 31 1EH 2FH Port 1 Status Registers Read Only 32 45 20H 2DH Port 2 Control Registers 46 47 2EH 2FH Port 2 Status Registers...

Страница 24: ...ess an image of registers 0 127 within the ASIC However in SPI Mode the system should first configure all desired settings then enable the switch via this bit Recall that DIP Switch S2 3 is used to se...

Страница 25: ...port is unplugged all addresses are automatically aged out 0 Do not allow fast aging Aging period remains 300 75 seconds 1 3 03H Global Control 1 04H Bit Function 7 Pass ALL Frames Enable 1 Switch al...

Страница 26: ...cannot cross VLAN boundary 0 Unicast packets excluding unknown multicast broadcast can cross VLAN boundary 1 6 Multicast Storm Protection Disable 1 Broadcast Storm Protection does not include multica...

Страница 27: ...2 bytes for tagged packets not including packets w STPID from CPU to ports 1 4 or up to including 1518 bytes for untagged packets Any packets larger than the specifed maximum are dropped This function...

Страница 28: ...er source port or destination port must match This is the mode used to implement Rx only sniff 0 6 06H Global Control 4 00H Bit Function 7 Switch MII Back Pressure Enable 1 Enable half duplex back pre...

Страница 29: ...Do Not Read Write 24H 11 0BH Global Control 9 00H Bit Function 7 2 Reserved For Factory Testing Do Not Write 0 1 LED Mode 0 MODE 0 1 MODE 1 0 1 LED 0 Red Speed Full Duplex LED 1 Yel Full Dx Collision...

Страница 30: ...ort the switch will add 802 1Q tags to packets without 802 1Q tags when received The switch will NOT add tags to packets already tagged The tag inserted is the ingress port VLAN ID port VID 0 Disable...

Страница 31: ...rol 1 See Port 1 Control 1 Description 1FH 18 12H Port 1 Control 2 0EH 06H Bit Function 7 Reserved Do Not Write 0 6 Ingress VLAN Filtering 1 The switch will discard packets whose VLAN ID VID port memb...

Страница 32: ...0 0 34 22H Port 2 Control 2 See Port 1 Control 2 Description 0EH 50 32H Port 3 Control 2 See Port 1 Control 2 Description 0EH 66 42H Port 4 Control 2 See Port 1 Control 2 Description 0EH 82 52H Port...

Страница 33: ...5 See Port 1 Control 5 Description 00H 85 55H Port 5 Control 5 See Port 1 Control 5 Description 00H 22 16H Port 1 Control 6 00H Bit Function 7 0 Transmit LOW Priority Rate Control 7 0 This byte along...

Страница 34: ...10 bits 7 4 form a 12 bit field to determine how many 32Kbps low priority blocks can be received in a unit of 32K bits or 4K bytes in a one second period 0 41 29H Port 2 Control 9 See Port 1 Control...

Страница 35: ...control 0 4 Low Priority Receive Rate Flow Control Enable 1 Flow control may be asserted if the port s low priority receive rate is exceeded 0 Flow control is not asserted if the port s low priority r...

Страница 36: ...d but failed Note that this function may be optionally configured via DIP switch S1 7 for port 4 only ON Half Duplex following reset 0 4 Advertise Flow Control Capability 1 Advertise Flow Control Capa...

Страница 37: ...loop back the PHY Tx channel to its Rx channel 0 Normal operation 0 45 2DH Port 2 Control 13 Port 1 Control 13 Description 00H 61 3DH Port 3 Control 13 Port 1 Control 13 Description 00H 77 4DH Port 4...

Страница 38: ...6 bit TOS field in the IP header The most significant 6 bits of the TOS field are fully decoded into 64 possibilities and the singular code that results is compared against the corresponding bit in t...

Страница 39: ...le selected 01 VLAN table selected 10 Dynamic address table selected 11 MIB counter selected 00 1 0 Indirect Access High Bits 9 8 of indirect address 00 111 6FH Indirect Access Control 1 SPI Mode Only...

Страница 40: ...tus LED s The relative function of these LED s is determined by DIP switch S2 4 in DIP Switch Mode or bit 1 of register 11 The following table gives the default LED indication mode 0 DIP switch S2 4 O...

Страница 41: ...1 and S2 3 ON to set the module to SPI Slave Mode ON Additionally make sure DIP switch S2 2 is OFF to enable SPI access Refer to this section for more information on unfamiliar terms topics and operat...

Страница 42: ...lity Port Control 12 Bit 3 Advertise 10baseT Full Duplex Capability Port Control 12 Bit 3 Advertise 10baseT Half Duplex Capability Port Status 0 Bit 3 Read for 100baseT Full Duplex Capable Port Status...

Страница 43: ...rame at any time Normally each device will first sense whether the line is idle and available for use channel clear If it is clear the device will begin to transmit its first frame During this transmi...

Страница 44: ...alid packet in Ethernet 64 bytes or 512 bits of data However if a transmit packet has a collision after 512 bit times of the transmission the packet will be dropped Late collisions refer to collisions...

Страница 45: ...nimum transmission time for a complete frame must be at least one slot time Further the time required for collisions to propagate the entire network must be less than one slot time As such a station c...

Страница 46: ...if a given network connection is permissible by making sure that the one way delay between the two furthest nodes is less than half the slot time 25 6us 10BaseT or 2 56us 100BaseT Times given above a...

Страница 47: ...eck Search Dynamic Table Search Static Table IGMP Process Spanning Tree Process Not Supported Network Time Parameter 10BaseT 10MHz 100BaseT 100MHz Bit Time BT 100ns 10ns Slot Time 512BT 51 2us 512BT 5...

Страница 48: ...Pause Scheme is used For half duplex segments the back pressure approach is used Full Duplex Flow Control Full duplex flow control is enabled by default but may be disabled via DIP switch S1 2 Per IE...

Страница 49: ...on time to clear its receive buffer by sending packets already in its queue For carrier sense the method used in 900EN S005 if back pressure is required the switch will send preambles to defer transmi...

Страница 50: ...orwarded to all ports except the source ingress port What can happen is that if a broadcast multicast or unicast message is transmitted at a port all other ports can become flooded with this transmiss...

Страница 51: ...interval expires If the rate limit is programmed greater than or equal to 128Kbps and the byte counter is 8Kbytes below the limit this flow control will still be triggered If the rate limit is program...

Страница 52: ...gh priority blocks can be received in a unit of 32K bits or 4K bytes in a one second period Port Control 9 bits 7 0 and Port Control 10 bits 7 4 Receive LOW Priority Rate Control A 12 bit number that...

Страница 53: ...possibilities and each resultant singular code is compared against the corresponding bit in the DSCP register If the register bit is 1 the priority is high and low if 0 Each port has an enable port DS...

Страница 54: ...ed to classify priority of incoming packets by comparing it against the User Priority Packet is high priority if user priority is greater than or equal to this number and low priority if less than thi...

Страница 55: ...twork segment or broadcast domain Port based VLAN s allow the end stations at different switch ports of the same switch to be included in a virtual network segment by grouping together one or more por...

Страница 56: ...at this port Set to include a port clear to exclude a port You must also include this port the ingress port The five ports of this switch are applied to bits 4 0 as follows Bit 4 Port 5 Bit 3 Port 4...

Страница 57: ...t 1 Port 3 Port 5 VLAN 5 Port 5 to All Membership Bits 4 0 11111 VLAN 4 Port 4 to Port 5 Membership Bits 4 0 11000 Note No broadcast traffic from Port 1 will go to Port 4 or Port 4 to Port 1 VLAN 1 Po...

Страница 58: ...over Data Rate Auto negotiated 10Mbps or 100Mbps Duplex Auto negotiated Full or Half Duplex Compliance IEEE 802 3 802 3u 802 3x Port Status Indicators Three LED s per port red yellow and green Two ind...

Страница 59: ...evice to be modified and optional modes of operation selected These switches are located in the top opening adjacent to the power terminals and reset button DIP switch S2 1 must be OFF to enable use o...

Страница 60: ...ess table and the MIB counters Use of the SPI interface in SPI Slave Mode is reserved for factory use only and is not covered in this manual Connector P1 This buffered combination I 2 C SPI interface...

Страница 61: ...torage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 non condensing Power Requirements Non polarized 15 36V DC SELV Safety Extra Low Voltage 2 6W Observe proper polarity See table f...

Страница 62: ...te measures Power Indicator Green LED ON indicates power internal 3 3V rail OK Port Status Indicators Three LED s per port red yellow and green Two indication modes combine speed link status activity...

Страница 63: ...ire that encircles the outer jacket A double shielded version adds an outer wire screen that surrounds the foil shield and also functions as a drain wire The drain wire or wire screen typically makes...

Страница 64: ...8CSR Regal Electronics www regalusa com see shielded plug model 1003B 8P8CSR C5 Complete premium double shielded Category 5e standard and crossover cables in variable lengths can be obtained from Lumb...

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