ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 81

• Manufacturer Part Number: ep2sgx30c
• Description: Stratix Ii Gx Device Data Sheet
• Manufacturer: Altera Corporation

Altera Corporation
October 2007
M4K RAM Blocks
The M4K RAM block includes support for true dual-port RAM. The M4K
RAM block is used to implement buffers for a wide variety of applications
such as storing processor code, implementing lookup schemes, and
implementing larger memory applications. Each block contains
4,608 RAM bits (including parity bits). M4K RAM blocks can be
configured in the following modes:
■
■
■
■
■
■
When configured as RAM or ROM, you can use an initialization file to
pre-load the memory contents.
The M4K RAM blocks allow for different clocks on their inputs and
outputs. Either of the two clocks feeding the block can clock M4K RAM
block registers (renwe, address, byte enable, datain, and output
registers). Only the output register can be bypassed. The six labclk
signals or local interconnects can drive the control signals for the A and B
ports of the M4K RAM block. ALMs can also control the clock_a,
clock_b, renwe_a, renwe_b, clr_a, clr_b, clocken_a, and
clocken_b signals, as shown in
True dual-port RAM
Simple dual-port RAM
Single-port RAM
FIFO
ROM
Shift register
Figure
Stratix II GX Device Handbook, Volume 1
2–51.
Stratix II GX Architecture
2–73