APA600-FG256A Datasheet, PDF (34/178 Pages) Actel Corporation – ProASICPLUS® Flash Family FPGAs

ProASIC^PLUS Flash Family FPGAs
Word
Depth
Word Width
9
9
9
9
256
9
9
256
256
9
9
9
256
256
256
256
256
256
88 blocks
Figure 2-20 • APA1000 Memory Block Architecture
Word Width
9
Word ₂₅₆
Depth
256
99
256 256
256 256
99
256 256
256 words x 18 bits, 1 read, 1 write
256
512 words x 18 bits, 1 read, 1 write
256
1,024 words x 9 bits, 1 read, 1 write
Total Memory Blocks Used = 10
Total Memory Bits = 23,040
Figure 2-21 • Example Showing Memory Arrays with Different Widths and Depths
Word Width ₉
Write Port
9 99 9 9
9
Write Port
99
Word
Depth
256 256 256 256
256 256
256 256 256 256
Read Ports
Read Ports
256 words x 9 bits, 2 read, 1 write
512 words x 9 bits, 4 read, 1 write
Total Memory Blocks Used = 10
Total Memory Bits = 6,912
Figure 2-22 • Multi-Port Memory Usage
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