XC3S100E Xilinx Corp., XC3S100E Datasheet - Page 44

• Manufacturer Part Number: XC3S100E
• Description: Spartan-3e Fpga Family Complete Data Sheet
• Manufacturer: Xilinx Corp.

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
44
Figure 35: Waveforms of Block RAM Data Operations with NO_CHANGE Selected
ADDR
Data_in
CLK
WE
DO
EN
DI
DISABLED
0000
DI
Internal
Memory
XXXX
aa
READ
MEM(aa)
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DO
bb
MEM(bb)=1111
1111
WRITE
the data driven just before WE is asserted. NO_CHANGE
timing is shown in the portion of
is High.
No change during write
2222
cc
MEM(cc)=2222
WRITE
dd
DS312-2_07_020905
XXXX
READ
MEM(dd)
Figure 35
DS312-2 (v3.6) May 29, 2007
Product Specification
during which WE
R