Operation Manual

Chapter 4 External I/O Connections 33
Note – All signals shown in TABLE 4-5 on page 32 are active low.
SCSI Implementation
■ SCSI-3 Fast-20 (UltraSCSI) parallel interface
■ 16-bit SCSI bus
■ 40Mbps data transfer rate
■ Support for 16 SCSI addresses:
■ Target 0 to 6 and 8 to F for devices
■ Target 7 reserved for SCSI host adapter on main logic board
15 GND 35 –DB<12>
16 GND 36 –DB<13>
17 TERMPWR 37 –DB<14>
18 TERMPWR 38 –DB<15>
19 Not connected 39 –PAR<1>
20 GND 40 –DB<0>
41 –DB<1> 55 –ATN
42 –DB<2> 56 GND
43 –DB<3> 57 –BSY
44 –DB<4> 58 –ACK
45 –DB<5> 59 –RST
46 –DB<6> 60 –MSG
47 –DB<7> 61 –SEL
48 –PAR<0> 62 –CD
49 GND 63 –REQ
50 TERM.DIS 64 –IO
51 TERMPWR 65 –DB<8>
52 TERMPWR 66 –DB<9>
53 Reserved 67 –DB<10>
54 GND 68 –DB<11>
TABLE 4-5 68-Pin SCSI Connector Pinout (Continued)
Pin Signal Name Pin Signal Name
LW3User.book Page 33 Wednesday, November 10, 1999 9:00 AM