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VSC870TX Datasheet(PDF) 9 Page - Vitesse Semiconductor Corporation |
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VSC870TX Datasheet(HTML) 9 Page - Vitesse Semiconductor Corporation |
9 / 40 page VITESSE SEMICONDUCTOR CORPORATION Data Sheet VSC870 High Performance Serial Backplane Transceiver G52190-0, Rev 4.1 Page 9 01/05/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com Internet: www.vitesse.com 1.2.1 Data Word Format at Transceiver Parallel Interface Data words contain a 32 bit user defined payload which is sent between the transmitting and receiving port cards as shown below. The RXTYP[1:0] and TXTYP[1:0] data word encoding format for different modes are described in later sections. Where: D[31:0]32 bit data payload 1.2.2 Data Word Format on the Serial Data Lines The data word format as seen at the serial output of the transceiver or switch chip is shown below. Two overhead bits are added by the transceiver or switch chip to designate a data word to the receiving switch chip or transceiver. The serial data is transmitted with the MSB first (B1, B0, D31, D30... D00). Where: B[1:0]If BYPASS=0,01=Flow control channel, 10=Flow control channel, 11=Acknowledge from switch chip or data header to switch chip If BYPASS = 1, RXTYP[1:0]=B[1:0]=TXTYP[1:0] D[31:0]32 bit data payload 1.2.3 Command Word Format at Transceiver Parallel Interface There are several command words that are used for sending information to the switch chip or a receiving port card. The command word format at the transceiver parallel interface is shown below. IDLE words are discussed in the next sections. A delay enable value can also be programmed into the transceiver for Packet Mode using this command word. Where: C[4:0]Command type: 00XXX=Link Control (00111=IDLE word) 01XX0=Command word for transceiver (01000=set DLYEN/CCKIN value) 10XX0=Command word for switch 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 D D D D 31 30 29 28 D D D D 27 26 25 24 D D D D 23 22 21 20 D D D D 19 18 17 16 D D D D 15 14 13 12 D D D D 11 10 09 08 D D D D 07 06 05 04 D D D D 03 02 01 00 --------------- Data Payload ---------------- 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 B B 1 0 D D D D 31 30 29 28 D D D D 27 26 25 24 D D D D 23 22 21 20 D D D D 19 18 17 16 D D D D 15 14 13 12 D D D D 11 10 09 08 D D D D 07 06 05 04 D D D D 03 02 01 00 --------------- Data Payload ---------------- 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 X X X C C C C C 04 03 02 01 00 D D D D 15 14 13 12 D D D D 11 10 09 08 D D D D 07 06 05 04 D D D D 03 02 01 00 X X X X X X X X -- Command -- -- Data -- |
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