Product manual

84 Barracuda 2LP Product Manual, Rev. D
Table 19. SCA contact assignments for ST31250DC /ST32550DC drives
++
++
+Signal Connector Connector
−−
−−
−Signal
name contact contact name
12V 1 41 12V GROUND
12V 2 42 12V GROUND
12V 3 43 12V GROUND
12V 4 44 12V GROUND
RESERVED/NC 5 45 RESERVED/NC
RESERVED/NC 6 46 DIFF SENSE
–DB (11) 7 47 +DB (11)
–DB (10) 8 48 +DB (10)
–DB (9) 9 49 +DB (9)
–DB (8) 10 50 +DB (8)
–I/O 11 51 +I/O
–REQ 12 52 +REQ
–C/D 13 53 +C/D
–SEL 14 54 +SEL
–MSG 15 55 +MSG
–RST 16 56 +RST
–ACK 17 57 +ACK
–BSY 18 58 +BSY
–ATN 19 59 +ATN
–DB(P0) 20 60 +DB (P0)
–DB(7) 21 61 +DB (7)
–DB(6) 22 62 +DB (6)
–DB(5) 23 63 +DB (5)
–DB(4) 24 64 +DB (4)
–DB(3) 25 65 +DB (3)
–DB(2) 26 66 +DB (2)
–DB(1) 27 67 +DB (1)
–DB(0) 28 68 +DB (0)
–DB(P1) 29 69 +DB (P1)
–DB(15) 30 70 +DB (15)
–DB(14) 31 71 +DB (14)
–DB(13) 32 72 +DB (13)
–DB(12) 33 73 +DB (12)
5V 34 74 5V GROUND
5V 35 75 5V GROUND
5V 36 76 5V GROUND
SYNC 37 77 ACTIVE LED OUT
RMT_START 38 78 DLYD_START
SCSI ID(0) 39 79 SCSI ID(1)
SCSI ID(2) 40 80 SCSI ID(3)
Notes:
1. The hyphen preceding a signal name indicates that signal is active low.
2. 8-bit devices that connect to the P cable should leave the following
signals open: –DB(12) –DB(13) –DB(14) –DB(15) –DB(P1) –DB(8)
–DB(9) –DB(10) –DB(11) DB(12) DB(13) DB(14) DB(15) DB(P1) DB(8)
DB(9) DB(10) DB(11). All other signals should be connected as defined.