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122 Xilinx Development System
Xilinx System Generator v2.1 Reference Guide
The number of bits used to implement a registered mealy state machine is given by
the equations:
where
N = total number of block RAM bits
k =
s = number of states
i = number of input bits
o = number of output bits
The following table gives examples of Block RAM sizes necessary for various state
machines:
The block RAM width and depth limitations are described in the online help for the
Single Port RAM block.
Xilinx LogiCORE
This block uses Version 3.2 of the Xilinx Single Port Block Memory LogiCORE.
The Core datasheet for the Single Port Block Memory 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
Number of
Output Bits
Block RAM Bits
Needed
2 5 10 704
41232
8 6 7 5120
16 5 4 4096
32 4 3 4096
52 1 11 2176
100 4 5 24576
depth 2
k
()2
i
() 2
ki+
==
width k o+=
N depth width× ko+()2
ki+
()==
s
2
log