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3.8 Pinout
DS21Q55 PIN DESCRIPTION Table 5-1
NOTE: Signal is common to all transceivers unless otherwise stated
PIN SYMBOL TYPE DESCRIPTION
U3 A0 I Address Bus Bit 0 (lsb).
L17 A1 I Address Bus Bit 1.
V2 A2 I Address Bus Bit 2.
T4 A3 I Address Bus Bit 3.
V8 A4 I Address Bus Bit 4.
H4 A5 I Address Bus Bit 5.
U8 A6 I Address Bus Bit 6.
P4 A7/ALE(AS) I Address Bus Bit 7 (msb) / Address Latch Enable.
M1 BPCLK1 O Back Plane Clock, Transceiver # 1.
H17 BPCLK2 O Back Plane Clock, Transceiver # 2.
F4 BPCLK3 O Back Plane Clock, Transceiver # 3.
V13 BPCLK4 O Back Plane Clock, Transceiver # 4.
P2 BTS I Bus Type Select (0 = Intel / 1 = Motorola),
P3 CS1* I Chip Select, Transceiver # 1.
A14 CS2* I Chip Select, Transceiver # 2.
B5 CS3* I Chip Select, Transceiver # 3.
K17 CS4* I Chip Select, Transceiver # 4.
U11 D0/AD0 I/O Data Bus Bit 0/ Address/Data Bus Bit 0 (lsb).
J19 D1/AD1 I/O Data Bus Bit 1/ Address/Data Bus Bit 1.
W15 D2/AD2 I/O Data Bus Bit 2/Address/Data Bus Bit 2.
U7 D3/AD3 I/O Data Bus Bit 3/Address/Data Bus Bit 3.
U9 D4/AD4 I/O Data Bus Bit 4/Address/Data Bus Bit 4.
U5 D5/AD5 I/O Data Bus Bit 5/Address/Data Bus Bit 5.
V4 D6/AD6 I/O Data Bus Bit 6/Address/Data Bus Bit 6.
U4 D7/AD7 I/O Data Bus Bit 7/Address/Data Bus Bit 7 (msb).
J3 DVDD1 – Digital Positive Supply.
N4 DVDD1 – Digital Positive Supply.
U2 DVDD1 – Digital Positive Supply.
V5 DVDD1 – Digital Positive Supply.
B12 DVDD2 – Digital Positive Supply.
C12 DVDD2 – Digital Positive Supply.
C16 DVDD2 – Digital Positive Supply.
D18 DVDD2 – Digital Positive Supply.
A9 DVDD3 – Digital Positive Supply.
B3 DVDD3 – Digital Positive Supply.
B6 DVDD3 – Digital Positive Supply.
C4 DVDD3 – Digital Positive Supply.
G20 DVDD4 – Digital Positive Supply.
M17 DVDD4 – Digital Positive Supply.
M20 DVDD4 – Digital Positive Supply.
P18 DVDD4 – Digital Positive Supply.
H3 DVSS1 – Digital Signal Ground.
U6 DVSS1 – Digital Signal Ground.
W8 DVSS1 – Digital Signal Ground.
A17 DVSS2 – Digital Signal Ground.