EP2S90F1020C5 Datasheet, PDF (381/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

TriMatrix Embedded Memory Blocks in Stratix II and Stratix II GX Devices
Independent Clock Mode
The TriMatrix memory blocks can implement independent clock mode
for true dual-port memory. In this mode, a separate clock is available for
each port (A and B). Clock A controls all registers on the port A side,
while clock B controls all registers on the port B side. Each port also
supports independent clock enables for port A and B registers.
Asynchronous clear signals for the registers, however, are supported.
Altera Corporation
January 2008
2–21
Stratix II Device Handbook, Volume 2