Datasheet

SN75976A, SN55976A
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SLLS218B – MAY 1995 – REVISED MAY 1997
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 2. Typical Signal and Terminal Assignments
SIGNAL TERMINAL SCSI DATA SCSI CONTROL IPI DATA IPI CONTROL
CDE0 54 DIFFSENSE DIFFSENSE V
CC
V
CC
CDE1 55 GND GND XMTA, XMTB GND
CDE2 56 GND GND XMTA, XMTB SLAVE/MASTER
BSR 2 GND GND GND, BSR GND
CRE 3 GND GND GND V
CC
1A 4 DB0, DB8 ATN AD7, BD7 NOT USED
1DE/RE 5 DBE0, DBE8 INIT EN GND GND
2A 6 DB1, DB9 BSY AD6, BD6 NOT USED
2DE/RE 7 DBE1, DBE9 BSY EN GND GND
3A 8 DB2, DB10 ACK AD5, BD5 SYNC IN
3DE/RE 9 DBE2, DBE10 INIT EN GND GND
4A 10 DB3, DB11 RST AD4, BD4 SLAVE IN
4DE/RE 11 DBE3, DBE11 GND GND GND
5A 19 DB4, DB12 MSG AD3, BD3 NOT USED
5DE/RE 20 DBE4, DBE12 TARG EN GND GND
6A 21 DB5, DB13 SEL AD2, BD2 SYNC OUT
6DE/RE 22 DBE5, DBE13 SEL EN GND GND
7A 23 DB6, DB14 C/D AD1, BD1 MASTER OUT
7DE/RE 24 DBE6, DBE14 TARG EN GND GND
8A 25 DB7, DB15 REQ AD0, BD0 SELECT OUT
8DE/RE 26 DBE7, DBE15 TARG EN GND GND
9A 27 DBP0, DBP1 I/O AP, BP ATTENTION IN
9DE/RE 28 DBPE0, DBPE1 TARG EN XMTA, XMTB V
CC
ABBREVIATIONS:
DBn = data bit n, where n = (0,1, . . . ,15)
DBEn = data bit n enable, where n = (0,1, . . . ,15)
DBP0 = parity bit for data bits 0 through 7 or IPI bus A
DBPE0 = parity bit enable for P0
DBP1 = parity bit for data bits 8 through 15 or IPI bus B
DBPE1 = parity bit enable for P1
ADn or BDn = IPI Bus A – Bit n (ADn) or Bus B – Bit n (BDn), where n = (0,1, ...,7)
AP or BP = IPI parity bit for bus A or bus B
XMTA or XMTB = transmit enable for IPI bus A or B
BSR = bit significant response
INIT EN = common enable for SCSI initiator mode
TARG EN = common enable for SCSI target mode
NOTE A: Signal inputs are shown as active high. When only active-low inputs are available, logic inversion
is accomplished by reversing the B+ and B– connector terminal assignments.