Product manual

Barracuda 2LP Product Manual, Rev. D 81
Table 17. Differential contact assignments (P cable)
for ST31250WD and ST32550WD drives
Signal Connector Connector Signal
name contact number contact number name
DB (12) 1 35 –DB (12)
DB (13) 2 36 –DB (13)
DB (14) 3 37 –DB (14)
DB (15) 4 38 –DB (15)
DB (P1) 5 39 –DB (P1)
GROUND 6 40 GROUND
DB (0) 7 41 –DB (0)
DB (1) 8 42 –DB (1)
DB (2) 9 43 –DB (2)
DB (3) 10 44 –DB (3)
DB (4) 11 45 –DB (4)
DB (5) 12 46 –DB (5)
DB (6) 13 47 –DB (6)
DB (7) 14 48 –DB (7)
DB (P) 15 49 –DB (P)
DIFFSENS 16 50 GROUND
TERMPWR 17 51 TERMPWR
TERMPWR 18 52 TERMPWR
RESERVED 19 53 RESERVED
ATN 20 54 –ATN
GROUND 21 55 GROUND
BSY 22 56 –BSY
ACK 23 57 –ACK
RST 24 58 –RST
MSG 25 59 –MSG
SEL 26 60 –SEL
C/D 27 61 –C/D
REQ 28 62 –REQ
I/O 29 63 –I/O
GROUND 30 64 GROUND
DB (8) 31 65 –DB (8)
DB (9) 32 66 –DB (9)
DB (10) 33 67 –DB (10)
DB (11) 34 68 –DB (11)
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.