IDT7207 CMOS ASYNCHRONOUS FIFO
32,768 x 9
Q 0 –Q 8
R, W, RS
Q 0 –Q 8
IDT7207
DEPTH
EXPANSION
BLOCK
MILITARY AND COMMERCIAL TEMPERATURE RANGES
Q 9 –Q 17
•••
Q 9 –Q 17
Q (N-8) -Q N
Q (N-8) -Q N
IDT7207
DEPTH
EXPANSION
BLOCK
IDT7207
DEPTH
EXPANSION
BLOCK
•••
D 0 -D 8
D 0 –D N
NOTES:
D 9 -D N
1. For depth expansion block see section on Depth Expansion and Figure 14.
2. For Flag detection see section on Width Expansion and Figure 13.
D 9 -D 17
•••
D 18 -D N
Figure 15. Compound FIFO Expansion
D (N-8) -D N
D (N-8) -D N
3140 drw 18
WA
FF A
DA 0-8
IDT
7ID20T7
7201A
RB
EF B
HF B
Q B 0-8
SYSTEM A
Q A 0-8
RA
HF A
EF A
IDT
7207
D B 0-8
WB
FF B
Figure 16. Bidirectional FIFO Operation
SYSTEM B
3140 drw 19
DATA IN
W
R
EF
DATA OUT
t RPE
t WLZ
t WEF
tA
Figure 17. Read Data Flow-Through Mode
5.05
t REF
DATA VALID
OUT
3171 drw 20
11