May 17, 1988 X3T9.2/88-048 Rev 1 The following pinouts for Cable A and Cable B, Single-Ended and Differential, are from Ed Gardner, Digital Equipment Corporation. They were worked out in colaboration with Paul Goldman. Sorry this was not ready in time for the May Working Group Meeting. They should be reviewed at the June Plenary Meeting. John Morse DEC Table 4-1: Single-Ended Pin Assignments (Alternative 2) Cable A (Low Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ GROUND 1 2 -DB(0) GROUND 3 4 -DB(1) GROUND 5 6 -DB(2) GROUND 7 8 -DB(3) GROUND 9 10 -DB(4) GROUND 11 12 -DB(5) GROUND 13 14 -DB(6) GROUND 15 16 -DB(7) GROUND 17 18 -DB(P) GROUND 19 20 GROUND GROUND 21 22 GROUND OPEN or GROUND 23 24 OPEN or GROUND OPEN 25 26 TERMPWR OPEN or GROUND 27 28 OPEN or GROUND GROUND 29 30 GROUND GROUND 31 32 -ATN GROUND 33 34 GROUND GROUND 35 36 -BSY GROUND 37 38 -ACK GROUND 39 40 -RST GROUND 41 42 -MSG GROUND 43 44 -SEL GROUND 45 46 -C/D GROUND 47 48 -REQ GROUND 49 50 -I/O ------------------------------------------------------------------------------ NOTE. (1) Pins assigned OPEN shall present a minimum impedance of 10K ohms to either ground or any non-OPEN pin. (2) The minus sign next to the signals indicates active low. IMPLEMENTORS NOTE: SCSI assigned pins 23, 24, 27, and 28 to GROUND. Pins 23, 24, 25, 27, and 28 may be re-assigned to TERMPWR in a future extension of SCSI-2. Table 4-2: Single-Ended Pin Assignments (Alternative 1) Cable A (High Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ GROUND 1 26 -DB(0) GROUND 2 27 -DB(1) GROUND 3 28 -DB(2) GROUND 4 29 -DB(3) GROUND 5 30 -DB(4) GROUND 6 31 -DB(5) GROUND 7 32 -DB(6) GROUND 8 33 -DB(7) GROUND 9 34 -DB(P) GROUND 10 35 GROUND GROUND 11 36 GROUND OPEN 12 37 OPEN OPEN 13 38 TERMPWR OPEN 14 39 OPEN GROUND 15 40 GROUND GROUND 16 41 -ATN GROUND 17 42 GROUND GROUND 18 43 -BSY GROUND 19 44 -ACK GROUND 20 45 -RST GROUND 21 46 -MSG GROUND 22 47 -SEL GROUND 23 48 -C/D GROUND 24 49 -REQ GROUND 25 50 -I/O ------------------------------------------------------------------------------ NOTE. (1) Pins assigned OPEN shall present a minimum impedance of 10K ohms to ground or any non-OPEN pin. (2) The minus sign next to the signals indicates active low. IMPLEMENTORS NOTE: Pins 12, 13, 14, 37, and 39 may be re-assigned to TERMPWR in a future extension of SCSI-2. Table 4-3: Single-Ended Pin Assignments Cable B (High Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ GROUND 1 35 GROUND GROUND 2 36 -DB(8) GROUND 3 37 -DB(9) GROUND 4 38 -DB(10) GROUND 5 39 -DB(11) GROUND 6 40 -DB(12) GROUND 7 41 -DB(13) GROUND 8 42 -DB(14) GROUND 9 43 -DB(15) GROUND 10 44 -DB(P1) GROUND 11 45 -ACKB GROUND 12 46 GROUND GROUND 13 47 -REQB GROUND 14 48 -DB(16) GROUND 15 49 -DB(17) GROUND 16 50 -DB(18) TERMPWRB 17 51 TERMPWRB TERMPWRB 18 52 TERMPWRB GROUND 19 53 -DB(19) GROUND 20 54 -DB(20) GROUND 21 55 -DB(21) GROUND 22 56 -DB(22) GROUND 23 57 -DB(23) GROUND 24 58 -DB(P2) GROUND 25 59 -DB(24) GROUND 26 60 -DB(25) GROUND 27 61 -DB(26) GROUND 28 62 -DB(27) GROUND 29 63 -DB(28) GROUND 30 64 -DB(29) GROUND 31 65 -DB(30) GROUND 32 66 -DB(31) GROUND 33 67 -DB(P3) GROUND 34 68 GROUND ------------------------------------------------------------------------------ NOTE. (1) The minus sign next to the signals indicates active low. Table 4-4: Differential Pin Assignments (Alternative 2) Cable A (Low Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ SHIELD GROUND 1 2 GROUND +DB(0) 3 4 -DB(0) +DB(1) 5 6 -DB(1) +DB(2) 7 8 -DB(2) +DB(3) 9 10 -DB(3) +DB(4) 11 12 -DB(4) +DB(5) 13 14 -DB(5) +DB(6) 15 16 -DB(6) +DB(7) 17 18 -DB(7) +DB(P) 19 20 -DB(P) DIFFSENS 21 22 GROUND OPEN or GROUND 23 24 OPEN or GROUND TERMPWR 25 26 TERMPWR OPEN or GROUND 27 28 OPEN or GROUND +ATN 29 30 -ATN GROUND 31 32 GROUND +BSY 33 34 -BSY +ACK 35 36 -ACK +RST 37 38 -RST +MSG 39 40 -MSG +SEL 41 42 -SEL +C/D 43 44 -C/D +REQ 45 46 -REQ +I/O 47 48 -I/O GROUND 49 50 GROUND ------------------------------------------------------------------------------ NOTE. (1) SHIELD GROUND is optional on some cables. (2) Pins assigned OPEN shall present a minimum impedance of 10K ohms to either ground or any non-OPEN pin. IMPLEMENTORS NOTE: Some shielded flat ribbon cables use pin 1 as a connection to the shield. IMPLEMENTORS NOTE: SCSI assigned pins 23, 24, 27, and 28 to GROUND. Pins 23, 24, 27, and 28 may be re-assigned to TERMPWR in a future extension of SCSI-2. Table 4-5: Differential Pin Assignments (Alternative 1) Cable A (High Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ SHIELD GROUND 1 26 GROUND +DB(0) 2 27 -DB(0) +DB(1) 3 28 -DB(1) +DB(2) 4 29 -DB(2) +DB(3) 5 30 -DB(3) +DB(4) 6 31 -DB(4) +DB(5) 7 32 -DB(5) +DB(6) 8 33 -DB(6) +DB(7) 9 34 -DB(7) +DB(P) 10 35 -DB(P) DIFFSENS 11 36 GROUND OPEN 12 37 OPEN TERMPWR 13 38 TERMPWR OPEN 14 39 OPEN +ATN 15 40 -ATN GROUND 16 41 GROUND +BSY 17 42 -BSY +ACK 18 43 -ACK +RST 19 44 -RST +MSG 20 45 -MSG +SEL 21 46 -SEL +C/D 22 47 -C/D +REQ 23 48 -REQ +I/O 24 49 -I/O GROUND 25 50 GROUND ------------------------------------------------------------------------------ NOTE. (1) SHIELD GROUND is optional on some cables. (2) Pins assigned OPEN shall present a minimum impedance of 10K ohms to either ground or any non-OPEN pin. IMPLEMENTORS NOTE: Some shielded flat ribbon cables use pin 1 as a connection to the shield. IMPLEMENTORS NOTE: Pins 12, 14, 37, and 39 may be re-assigned to TERMPWR in a future extension of SCSI-2. Table 4-6: Differential Pin Assignments Cable B (High Density Connector) ------------------------------------------------------------------------------ Signal Name Pin Number Signal Name ------------------------------------------------------------------------------ GROUND 1 35 GROUND +DB(8) 2 36 -DB(8) +DB(9) 3 37 -DB(9) +DB(10) 4 38 -DB(10) +DB(11) 5 39 -DB(11) +DB(12) 6 40 -DB(12) +DB(13) 7 41 -DB(13) +DB(14) 8 42 -DB(14) +DB(15) 9 43 -DB(15) +DB(P1) 10 44 -DB(P1) +ACKB) 11 45 -ACKB GROUND 12 46 DIFFSENS +REQB 13 47 -REQB +DB(16) 14 48 -DB(16) +DB(17) 15 49 -DB(17) +DB(18) 16 50 -DB(18) TERMPWRB 17 51 TERMPWRB TERMPWRB 18 52 TERMPWRB +DB(19) 19 53 -DB(19) +DB(20) 20 54 -DB(20) +DB(21) 21 55 -DB(21) +DB(22) 22 56 -DB(22) +DB(23) 23 57 -DB(23) +DB(P2) 24 58 -DB(P2) +DB(24) 25 59 -DB(24) +DB(25) 26 60 -DB(25) +DB(26) 27 61 -DB(26) +DB(27) 28 62 -DB(27) +DB(28) 29 63 -DB(28) +DB(29) 30 64 -DB(29) +DB(30) 31 65 -DB(30) +DB(31) 32 66 -DB(31) +DB(P3) 33 67 -DB(P3) GROUND 34 68 GROUND ------------------------------------------------------------------------------