A synchronous, true dual-port memory, with registered inputs and optionally registered outputs, available in Stratix^™ and Stratix^™ GX devices. The M-RAM (mega RAM) is useful for applications where a large volume of data must be stored on the device. Each block is a 4096 × 144 RAM block and contains 589,824 RAM bits, including parity bits. The M-RAM can be configured 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.

When implementing memory in Stratix and Stratix GX devices, the M-RAM can be configured in any of the following sizes:

Operation Mode	M-RAM Size
Single-port	4096 × 144 8192 × 72 16384 × 36 32768 × 18 65536 × 9
Dual-port	Read × M / Write × N R × 144 / W × 144 M, N = 9, 18, 36, or 72
True dual-port	port A × M / port B × N M, N = 9, 18, 36, or 72

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