Avago Technologies LSI53C895A - Manual (Page 100)

3-12 Signal Descriptions
3.4.2 SCSI Signals
Table 3.10 describes the SCSI signals.
Table 3.10 SCSI Signals
Name PQFP BGA Pos Type Strength Description
SD[15:0]
−
SDP[1:0]
−
167, 170, 172,
175, 87, 89, 92,
94, 135, 137,
140, 142, 145,
147, 149, 162
165, 132
F2, G2, H2, J3,
G20, F20, E20,
D20, A9, A8,
A7, B6, B5, B4,
B3, C1
E1, B10
I/O 48 mA
SCSI
SCSI Data.
SCSI Parity.
LVD Mode: Negative half of LVDlink pair for SCSI data and parity lines. SD[15:0]
−
are the 16-bit SCSI
data bus, and SDP[1:0]
−
are the SCSI data parity lines.
SE Mode: SD[15:0]
−
are the 16-bit SCSI data bus, and SDP[1:0]
−
are the SCSI data parity lines.
HVD Mode: SD[15:0]
−
and SDP1:0]
−
are the SCSI data bus and parity lines.
SD[15:0]+
SDP[1:0]+
168, 171, 173,
176, 88, 90, 93,
95, 136, 138,
141, 143, 146,
148, 150, 163
166, 133
F1, G1, H1, J2,
G19, F19, E19,
D19, B9, B8,
B7, A5, A4, A3,
B2, D1
F3, C10
I/O 48 mA
SCSI
SCSI Data.
SCSI Parity.
LVD Mode: Positive half of LVDlink pair for SCSI data lines. SD[15:0]+ are the 16-bit data bus, and
SDP[1:0]+ are the SCSI data parity lines.
SE Mode: SD[15:0]+ and SDP[1:0]+ are at 0 Volts.
HVD Mode: SD[15:0]+ and SDP[1:0]+ are driver directional control for SCSI data bus and parity lines.
DIFFSENS 84 H20 I N/A SCSI Differential Sense
pin detects the present
mode of the SCSI bus
when connected to the
DIFFSENS signal on the
physical SCSI bus.
LVD Mode: When a voltage between 0.7 V and 1.9 V is present on this pin, the LSI53C895A will
operate in the LVD mode.
SE Mode: When this pin is driven LOW (below 0.5 V) indicating SE bus operation, the LSI53C895A
will operate in the SE mode.
HVD Mode: When this pin is detected HIGH (above 2.4 V) indicating a HVD bus, the LSI53C895A will
3-state its SCSI drivers. Set the DIF bit in
SCSI Test Two (STEST2) to enable HVD drivers.