7204L50P Datasheet, PDF (11/14 Pages) Integrated Device Technology – First-In/First-Out Dual-Port memory

IDT7203/7204/7205/7206/7207/7208 CMOS ASYNCHRONOUS FIFO
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, INDUSTRIAL AND MILITARY
TEMPERATURE RANGES
TRUTH TABLES
TABLE 1 – RESET AND RETRANSMIT
SINGLE DEVICE CONFIGURATION/WIDTH EXPANSION MODE
Mode
Inputs
RS
FL/RT
XI
Internal Status
Read Pointer
Write Pointer
Reset
Retransmit
Read/Write
0
X
0
Location Zero
Location Zero
1
0
0
Location Zero
Unchanged
1
1
0
Increment⁽¹⁾
Increment⁽¹⁾
NOTE:
1. Pointer will Increment if flag is HIGH.
TABLE 2 – RESET AND FIRST LOAD
DEPTH EXPANSION/COMPOUND EXPANSION MODE
Inputs
Mode
RS
FL/RT
XI
Internal Status
Read Pointer
Write Pointer
Reset First Device
Reset All Other Devices
Read/Write
0
0
(1)
Location Zero
0
1
(1)
Location Zero
1
X
(1)
X
Location Zero
Location Zero
X
Outputs
EF
FF
HF
0
1
1
X
X
X
X
X
X
Outputs
EF
FF
0
1
0
1
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
W
D
9
FULL
RS
XO
IDT
FF
7203
EF
7204
9
7205
7206
9
7207
FL
7208
XI
FF
9
XO
IDT
7203
EF
7204
7205
7206
7207
FL
7208
XI
FF
9
XO
IDT
7203
EF
7204
7205
7206
7207
7208
FL
XI
R
Q
VCC
EMPTY
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)
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