EP2AGX95EF29C6N Datasheet, PDF (61/380 Pages) Altera Corporation – Device Interfaces and Integration

Chapter 3: Memory Blocks in Arria II Devices
Memory Modes
3–13
Simple dual-port mode supports different read and write data widths (mixed width
support). Table 3–5 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 3–5. M9K Block Mixed-Width Configurations (Simple Dual-Port Mode)
Read Port
8K × 1
4K × 2
2K × 4
1K × 8
512 × 16
256 × 32
1K × 9
512 × 18
256 × 36
8K × 1
v
v
v
v
v
v
—
—
—
4K × 2
v
v
v
v
v
v
—
—
—
2K × 4
v
v
v
v
v
v
—
—
—
1K × 8
v
v
v
v
v
v
—
—
—
Write Port
512 × 16
v
v
v
v
v
v
—
—
—
256 × 32
v
v
v
v
v
v
—
—
—
1K × 9
—
—
—
—
—
—
v
v
v
512 × 18
—
—
—
—
—
—
v
v
v
256 × 36
—
—
—
—
—
—
v
v
v
Table 3–6 lists the mixed-width configurations for M144K blocks in simple dual-port
mode.
Table 3–6. M144K Block Mixed-Width Configurations (Simple Dual-Port Mode)
Read Port
16K × 8
8K × 16
4K × 32
2K × 64
16K × 9
8K × 18
4K × 36
2K × 72
16K × 8
v
v
v
v
—
—
—
—
8K × 16
v
v
v
v
—
—
—
—
4K × 32
v
v
v
v
—
—
—
—
Write Port
2K × 64
v
v
v
v
—
—
—
—
16K × 9
—
—
—
—
v
v
v
v
8K × 18
—
—
—
—
v
v
v
v
4K × 36
—
—
—
—
v
v
v
v
2K × 72
—
—
—
—
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 “don’t care” or “old data” value.
MLABs only support a write-enable signal. Read-during-write behavior for the
MLABs can be either a “don’t care” or “old data” 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