IDT72131L35P Просмотр технического описания (PDF) - Integrated Device Technology
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IDT72131L35P Datasheet PDF : 13 Pages
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IDT72131, IDT72141
CMOS PARALLEL-TO-SERIAL FIFO 2048 x 9 & 4096 x 9
COMMERCIAL TEMPERATURE RANGES
Depth Expansion (Daisy Chain) Mode
The IDT72131/41 can be easily adapted to applications
where the requirements are for greater than 2048/4096 words.
Figure 14 demonstrates Depth Expansion using three
IDT72131/41. Any depth can be attained by adding additional
IDT72131/41 operates in the Depth Expansion configuration
when the following conditions are met:
1. The first device must be designated by grounding the
First Load (FL) control input.
2. All other devices must have FL in the HIGH state.
3. The Expansion Out (XO) pin of each device must be
tied to the Expansion In (XI) pin of the next device.
4. External logic is needed to generate a composite Full
Flag (FF) and Empty Flag (EF). This requires the
OR-ing of all EFs and OR-ing of all FFs (i.e., all must be
set to generate the correct composite FF or EF).
5. The Retransmit (RT) function and Half-Full Flag (HF)
are not available in the Depth Expansion mode.
SOCP
SO
FL/RT
SOX
VCC
FIFO #1
IDT72141
SO SOCP
VCC
FL/RT
SOX
VCC
FIFO #2
IDT72141
SO SOCP
VCC
FL/RT
SOX
VCC
FIFO #3
IDT72141
SO SOCP
XI
D 0-7
W
NR
XO
Q7
XI
D 0-7
W
NR
XO
Q7
XI
D 0-7
W
NR
XO
Q7
Figure 14. A 12K x 8 Parallel-In Serial-Out FIFO
D 0-7
W
2751 drw 17
TABLE 2: RESET AND FIRST LOAD TRUTH TABLE —
DEPTH EXPANSION/COMPOUND EXPANSION MODE
Inputs
Internal Status
Mode
RS
FL
XI
Read Pointer
Write Pointer
EF
Reset-First
0
0
(1)
Location Zero
Location Zero
0
Device
Reset-All
0
1
(1)
Location Zero
Location Zero
0
Other Devices
Read/Write
1
X
(1)
X
X
X
NOTES:
1. XI is connected to XO of previous device.
2. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Ouput, FF = Full Flag Output, XI = Expansion Input.
Outputs
FF
1
1
X
2751 tbl 10
5.34
12
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