CY7C4215-15AXI(2011) 데이터 시트보기 (PDF) - Cypress Semiconductor
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CY7C4215-15AXI Datasheet PDF : 25 Pages
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CY7C4205/CY7C4215
CY7C4225/CY7C4245
Width Expansion Configuration
The CY7C42X5 can be expanded in width to provide word widths
greater than 18 in increments of 18. During width expansion
mode all control line inputs are common and all flags are
available. Empty (Full) flags should be created by ANDing the
Empty (Full) flags of every FIFO. This technique will avoid ready
data from the FIFO that is “staggered” by one clock cycle due to
the variations in skew between RCLK and WCLK. Figure 2
demonstrates a 36-word width by using two CY7C42X5.
Figure 2. Block Diagram of Synchronous FIFO Memories Used in a Width Expansion Configuration
RESET (RS)
DATAIN (D) 36 18
WRITE CLOCK (WCLK)
WRITE ENABLE (WEN)
LOAD (LD)
PROGRAMMABLE(PAE)
HALF FULL FLAG (HF)
7C4205
7C4215
7C4225
7C4245
FULL FLAG (FF)
FF
EF
18
RESET (RS)
18
READ CLOCK (RCLK)
READ ENABLE (REN)
OUTPUT ENABLE(OE)
7C4205
7C4215
7C4225
7C4245
FF
EF
PROGRAMMABLE(PAF)
EMPTYFLAG (EF)
18 DATA OUT (Q) 36
FIRSTLOAD (FL)
WRITE EXPANSION IN (WXI)
READ EXPANSION IN (RXI)
FIRST LOAD (FL)
WRITE EXPANSION IN (WXI)
READ EXPANSION IN (RXI)
Depth Expansion Configuration (with Program-
mable Flags)
The CY7C42X5 can easily be adapted to applications requiring
more than 256/512/1024/4096 words of buffering. Figure 3 shows
Depth Expansion using three CY7C42X5s. Maximum depth is
limited only by signal loading. Follow these steps:
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 Write Expansion Out (WXO) pin of each device must be
tied to the Write Expansion In (WXI) pin of the next device.
4. The Read Expansion Out (RXO) pin of each device must be
tied to the Read Expansion In (RXI) pin of the next device.
5. All Load (LD) pins are tied together.
6. The Half-Full Flag (HF) is not available in the Depth
Expansion Configuration.
7. EF, FF, PAE, and PAF are created with composite flags by
ORing together these respective flags for monitoring. The
composite PAE and PAF flags are not precise.
Document Number: 001-45652 Rev. *B
Page 8 of 25
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