Xilinx V2.1 Manual do Utilizador Página 126

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126 Xilinx Development System
Xilinx System Generator v2.1 Reference Guide
where
N
s
= total number of next state logic block RAM bits
k =
d
s
= depth of state logic block RAM
w
s
= width of state logic block RAM
s = number of states
i = number of input bits
The following table gives examples of Block RAM sizes necessary for various state
machines:
Xilinx LogiCORE
This block uses Version 3.2 of the Xilinx Single Port Block Memory LogiCORE.
The block RAM width and depth limitations are described in the core datasheet for
the Single Port Block Memory, which may be found locally at:
%XILINX%\coregen\ip\xilinx\eip1\com\xilinx\ip\blkmemsp_v3_2\do
c\sp_block_mem.pdf
Number of States Number of
Input Bits
Block RAM Bits
Needed
2564
418
8 6 1536
16 5 2048
32 4 2560
52 1 768
100 4 14336
s
2
log
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