EP2S90F1020C5 Datasheet, PDF (388/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Clock Modes
Single-Clock Mode
Stratix II and Stratix II GX TriMatrix memory blocks implement
single-clock mode for true dual-port, simple dual-port, and single-port
memory. In this mode, a single clock, together with clock enable, is used
to control all registers of the memory block. Asynchronous clear signals
for the registers, however, are not supported. Figures 2–17 through 2–19
show the memory block in single-clock mode for true dual-port, simple
dual-port, and single-port modes, respectively.
2–28
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008