Scsi Signals - LSI Symbios SYM53C040 Technical Manual

3.1.2 SCSI Signals

Table 3.6 SCSI Signals
Pin Pin
Name Number
DIFFSENS 93
SHID2− 94
SHID2+ 95
SHID1− 96
SHID1+ 97
SHID0− 98
SHID0+ 99
Table 3.6 describes the signals for the SCSI Signals group.
BGA Ball
Number
H11 SCSI DIFFSENS signal. A low level
input enables SCSI SE mode. A mid-
range level input enables SCSI LVD
mode. A high level input enables
SFF-8067 Mode. Tie this pin to V
to enable SFF-8067 mode.
H12 SCSI High ID 2. This LVD SCSI pair
H13 may be connected to any of the SCSI
data signals from data bit 8 through
15. This provides the means for the
SCSI core to respond to selection as
a device with an ID greater than 7.
In SE mode, the SHID2− pin is the
SE signal pin, and the SHID2+ pin
should be connected as a virtual
ground on the SCSI connector.
H9 SCSI High ID 1. This LVD SCSI pair
G11 may be connected to any of the SCSI
data signals from data bit 8 through
15. This enables the SCSI core to
respond to selection as a device with
an ID greater than 7.
In SE mode, the SHID1− pin is the
SE signal pin, and the SHID1+ pin
should be connected as a virtual
ground on the SCSI connector.
G12 SCSI High ID 0. This LVD SCSI pair
G13 may be connected to any of the SCSI
data signals from data bit 8 through
15. This enables the SCSI core to
respond to selection as a device with
an ID greater than 7.
In SE mode, the SHID0− pin is the
SE signal pin, and the SHID0+ pin
should be connected as a virtual
ground on the SCSI connector.
Safety Mode Signals
Description
DD
Internal
Pad Type Resistor
Analog –
input
SE or LVD None
SCSI I/O
SE or LVD None
SCSI I/O
SE or LVD None
SCSI I/O
3-13