MS7201-25JC 查看數據表（PDF） - Mosel Vitelic Corporation
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MS7201-25JC Datasheet PDF : 11 Pages
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MOSEL VITELIC
Width Expansion Mode
Word width may be expanded by connecting the
corresponding control input signals of multiple
devices together. The EMPTY, HALF FULL and
FULL FLAGS (EE, HF and FF) can be detected by
MS7200L/7201AL/7202AL
any particular device. Figure 4 shows an 18 bit wide
configuration using two devices. They may be
configured to any word width in this manner.
HALF FULL FLAG (HF)
DATA IN
(D)
9
18
WRITE
(W)
(FF)
(RS)
FULL FLAG
RESET
9
(HF) HALF FULL FLAG
BITS
0-8
MS
7201A
9
XI
MS
7201A
BITS
9-17
XI
READ
(R)
EMPTY FLAG
(EF)
(RT)
RETRANSMIT
18
9
(Q)
DATA OUT
NOTES:
Figure 4. Width Expansion Mode
Flag detection is accomplished by monitoring the EF, HF and EF pins on the device used in
the Width Expansion Mode. Do not connect output control signals together.
Depth Expansion (Daisy Chain) Mode
Word depths may be expanded in multiples of
512 words by Daisy Chaining the devices together
as follows:
1. The FIRST LOAD (FL) control signal of the first
device must be grounded. This FIFO repre-
sents word 1-512.
2. All other devices in the Daisy Chain must have
the FIRST LOAD (FL) control signal tied to VCC
in the inactive-high state.
3. The EXPANSION OUT (XO) pin of each device
must be connected to the EXPANSION IN (XI)
pin of the next device as shown in Figure 5.
4. External logic is required to generate a com-
mon FULL FLAG (FF) and EMPTY FLAG (EF)
signal by ORing all of the FFs together and
ORing all of the EFs together.
5. The RETRANSMIT (RT) fuction and HALF
FULL FLAG (HF) are not available in Daisy
Chain Mode.
W
9
D
FULL
RS
XO
FF
9
MS
EF
7201
WORDS
1025-
1536
XI
FL
XO
FF
9
MS
EF
7201
WORDS
1513-
1024
FL
XI
XO
FF
9
MS
EF
7201
WORDS
1-512
FL
XI
R
9
Q
VCC
EMPTY
Figure 5. Diagram of a 1536 x 9 FIFO in Depth Expansion Mode
MS7200L/01AL/02AL Rev. 1.0 January 1995
10
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