M-RAM Definition
A synchronous, true dual-port memory, with registered inputs and optionally registered outputs, available in supported device (Arria® series devices) families. The M-RAM ( mega RAM) is useful for applications where a large volume of data must be stored on the device. In supported device, except for Stratix® III devices, each block is a 4096 × 144 RAM block and contains 589,824 RAM bits, including parity bits. You can configure the M-RAM as true dual-port, dual-port, and single-port RAM, and FIFO buffers; however, the M-RAM cannot be configured upon initialization. The design cannot assume a 0 or a 1 value inside the RAM at the end of configuration, so the RAM bits at the end of configuration are X (don't care) bits.
The following table lists the configurable sizes for the M-RAM memory block:
|
Operation Mode |
M-RAM Size |
|---|---|
|
Single-port |
4096 × 144 8192 × 72 16384 × 36 32768 × 18 65536 × 9 |
|
Dual-port |
Read × M / Write × N Read × 144 / Write × 144 M, N = 9, 18, 36, or 72 |
|
True dual-port |
port A × M / port B × N M, N = 9, 18, 36, or 72 |