XC3S100E-4CP132C XILINX [Xilinx, Inc], XC3S100E-4CP132C Datasheet - Page 41
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XC3S100E-4CP132C
Manufacturer Part Number
XC3S100E-4CP132C
Description
Spartan-3E FPGA Family
Manufacturer
XILINX [Xilinx, Inc]
Datasheet
1.XC3S100E-4CP132C.pdf
(193 pages)
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Functional Description
Setting the WRITE_MODE attribute to a value of
NO_CHANGE, puts the DO outputs in a latched state when
asserting WE. Under this condition, the DO outputs retain
34
Figure 32: Waveforms of Block RAM Data Operations with NO_CHANGE Selected
Figure 31: Waveforms of Block RAM Data Operations with READ_FIRST Selected
Data_in
ADDR
ADDR
Data_in
CLK
CLK
WE
WE
DO
DO
EN
EN
DI
DI
DISABLED
DISABLED
0000
0000
DI
DI
Internal
Internal
Memory
Memory
XXXX
XXXX
aa
aa
READ
READ
MEM(aa)
MEM(aa)
DO
www.xilinx.com
DO
1111
bb
MEM(bb)=1111
1111
bb
MEM(bb)=1111
WRITE
WRITE
old MEM(bb)
the data driven just before WE is asserted. NO_CHANGE
timing is shown in the portion of
is High.
Prior stored data
No change during write
2222
cc
2222
cc
MEM(cc)=2222
MEM(cc)=2222
WRITE
WRITE
old MEM(cc)
dd
dd
DS312-2_06_020905
DS312-2_07_020905
XXXX
XXXX
READ
READ
Advance Product Specification
MEM(dd)
MEM(dd)
DS312-2 (v1.1) March 21, 2005
Figure 32
during which WE
R
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