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Operational Environment 3-7

3.2.2 The SCSI Interface

The SCSI interface conforms to ANSI X 3T10.11/1142. The SCSI

interface operates as 16-bit, synchronous or asynchronous, SE or LVD,

and supports Ultra160 SCSI protocols. Arbitration is supported for 8-bit

(at lower SCSI speeds) and 16-bit. Active SE or LVD SCSI termination

is provided automatically. The LSI20160 supplies the SCSI termination

power.

Connector J2 makes the external connection, which provides LVD/SE

SCSI termination. Connector J4 makes the internal connection, which

only provides LVD SCSI termination.

Table 3.4 shows the signal assignments for J2 and J4.

Table 3.4 SCSI Interface

Signal Name Pin Signal Name Pin Signal Name Pin

SD12+ 1 SACK+ 24 SD7− 47

SD13+ 2 SRST+ 25 SDP− 48

SD14+ 3 SMSG+ 26 GND 49

SD15+ 4 SSEL+ 27 Cable_prnt 50

SDP1+ 5 SC_D+ 28 TERMPWR 51

SD0+ 6 SREQ+ 29 TERMPWR 52

SD1+ 7 SI_O+ 30 N/C 53

SD2+ 8 SD8+ 31 GND 54

SD3+ 9 SD9+ 32 SATN− 55

SD4+ 10 SD10+ 33 GND 56

SD5+ 11 SD11+ 34 SBSY− 57

SD6+ 12 SD12− 35 SACK− 58

SD7+ 13 SD13− 36 SRST− 59

SDP+ 14 SD14− 37 SMSG− 60

GND 15 SD15− 38 SSEL− 61

DIFFSENS 16 SDP1− 39 SC_D− 62

TERMPWR 17 SD0− 40 SREQ− 63

TERMPWR 18 SD1− 41 SI_O− 64

N/C 19 SD2− 42 SD8− 65

GND 20 SD3− 43 SD9− 66

SATN+ 21 SD4− 44 SD10− 67

GND 22 SD5− 45 SD11− 68

SBSY+ 23 SD6− 46

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 61 62

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Lsi 20160 Manual do Utilizador Página 45