IDT7203/7204/7205/7206/7207/7208CMOSASYNCHRONOUSFIFO
2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9, 65,536 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
TRUTHTABLES
TABLE 1 RESET AND RETRANSMIT
SINGLEDEVICECONFIGURATION/WIDTHEXPANSIONMODE
Inputs
InternalStatus
Write Pointer
Outputs
Mode
RS
FL/RT
XI
Read Pointer
EF
FF
HF
Reset
0
1
1
X
0
0
0
0
LocationZero
LocationZero
LocationZero
Unchanged
0
1
1
Retransmit
Read/Write
NOTE:
X
X
X
X
X
X
(1)
(1)
1
Increment
Increment
1. Pointer will Increment if flag is HIGH.
TABLE 2 RESET AND FIRST LOAD
DEPTHEXPANSION/COMPOUNDEXPANSIONMODE
Inputs
InternalStatus
Outputs
Mode
RS
FL/RT
XI
Read Pointer
Write Pointer
EF
FF
ResetFirstDevice
Reset All Other Devices
Read/Write
0
0
1
0
1
(1)
(1)
(1)
LocationZero
LocationZero
X
LocationZero
LocationZero
X
0
0
1
1
X
X
X
NOTES:
1. XI is connected to XO of previous device. See Figure 14.
2. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output, XI = Expansion Input, HF = Half-Full Flag Output
XO
IDT
7203
R
W
FF
EF
FL
7204
7205
7206
7207
7208
Q
D
9
9
9
V
CC
XI
XO
IDT
FF
EF
FL
7203
7204
7205
7206
7207
7208
EMPTY
FULL
9
XI
XO
IDT
FF
EF
7203
7204
7205
7206
7207
7208
9
RS
FL
XI
2661 drw16
Figure 14. Block Diagram of 6,144 x 9, 12,288 x 9, 24,576 x 9, 49,152 x 9, 98,304 x 9, 196,608 x 9 FIFO Memory (Depth Expansion)
11
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
