Cyclone Device Handbook, Volume 1
is not available in the true dual-port mode. Mixed-width configurations
are also possible, allowing different read and write widths. Tables 2–3
and 2–4 summarize the possible M4K RAM block configurations.
Table 2–3. M4K RAM Block Configurations (Simple Dual-Port)
Write Port
Read Port
4K × 1
4K × 1 2K × 2 1K × 4 512 × 8 256 × 16 128 × 32 512 × 9 256 × 18 128 × 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
2K × 2
1K × 4
512 × 8
256 × 16
128 × 32
512 × 9
256 × 18
128 × 36
v
v
v
v
v
v
v
v
v
Table 2–4. M4K RAM Block Configurations (True Dual-Port)
Port B
Port A
4K × 1
v
2K × 2
v
1K × 4
v
512 × 8
v
256 × 16
v
512 × 9
256 × 18
4K × 1
2K × 2
v
v
v
v
v
1K × 4
v
v
v
v
v
512 × 8
256 × 16
512 × 9
256 × 18
v
v
v
v
v
v
v
v
v
v
v
v
v
v
When the M4K RAM block is configured as a shift register block, you can
create a shift register up to 4,608 bits (w × m × n).
2–22
Preliminary
Altera Corporation
January 2007
ALTERA [ ALTERA CORPORATION ]
