Pls answer my question!

[stocking]

Pls tell me the question:
In synchronous dual-port sram, must both clka and clkb be same?
What is synchronous dual-port sram.

 

[ami]

Hi,
In synchronous dual port SRAM, clocka(portA) and clockb(portB) can be different ( in frequency or phase).
but the problem is when portA and portB access to 1 location( and violate the timing of RAM), the data in that location may be corrupted
---> you need a control method between clocka and clockb
+ clocka and clockb is different in frequency but have a fixed-phase-relationship(divided clocks) ---> satisfy timing between portA/portB access at same location
+ clocka and clockb is different in frequency and phase ----> need a control method to avoid same address access.
Rgrds

 

[AlexWan]

What is synchronous dual-port sram.

Here, "synchronous" or "asynchronous" is for access mode, not clock relationship.

 

[stocking]

thanks! AlexWan. Now know the difference between synchronous" or "asynchronous. synchronous means that clka and dataa is synchronous, right?

 

[farmerwang]

correct.