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EP2AGZ225HF40I3N Datasheet, PDF (61/382 Pages) Altera Corporation – Volume 1: Device Interfaces and Integration | |||
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Chapter 3: Memory Blocks in Arria II Devices
Memory Modes
3â13
Simple dual-port mode supports different read and write data widths (mixed width
support). Table 3â5 lists the mixed width configurations for the M9K blocks in simple
dual-port mode. MLABs do not have native support for mixed width operations. The
Quartus II software can implement mixed width memories in MLABs with more than
one MLAB.
Table 3â5. M9K Block Mixed-Width Configurations (Simple Dual-Port Mode)
Read Port
Write Port
8K Ã 1 4K Ã 2 2K Ã 4 1K Ã 8 512 Ã 16 256 Ã 32
8K Ã 1
4K Ã 2
2K Ã 4
1K Ã 8
512 Ã 16
256 Ã 32
1K Ã 9
512 Ã 18
256 Ã 36
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
v
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
1K Ã 9
â
â
â
â
â
â
v
v
v
512 Ã 18
â
â
â
â
â
â
v
v
v
256 Ã 36
â
â
â
â
â
â
v
v
v
Table 3â6 lists the mixed-width configurations for M144K blocks in simple dual-port
mode.
Table 3â6. M144K Block Mixed-Width Configurations (Simple Dual-Port Mode)
Read Port
16K Ã 8
8K Ã 16
4K Ã 32
2K Ã 64
16K Ã 9
8K Ã 18
4K Ã 36
2K Ã 72
16K Ã 8
v
v
v
v
â
â
â
â
8K Ã 16
v
v
v
v
â
â
â
â
4K Ã 32
v
v
v
v
â
â
â
â
Write Port
2K Ã 64
v
v
v
v
â
â
â
â
16K Ã 9
â
â
â
â
v
v
v
v
8K Ã 18
â
â
â
â
v
v
v
v
4K Ã 36
â
â
â
â
v
v
v
v
2K Ã 72
â
â
â
â
v
v
v
v
In simple dual-port mode, M9K and M144K blocks support separate write-enable and
read-enable signals. Read-during-write operations to the same address can either
output a âdonât careâ or âold dataâ value.
MLABs only support a write-enable signal. Read-during-write behavior for the
MLABs can be either a âdonât careâ or âold dataâ value. The available choices depend
on the configuration of the MLAB.
December 2011 Altera Corporation
Arria II Device Handbook Volume 1: Device Interfaces and Integration
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