Zhi
05-23-2007, 06:23 PM
Thank you Mike.
My RAM is a dual port RAM. There are already data in the RAM. I point
to one specific address when I need its data. Cannot it be read in one
cycle? Do you mean in testbench we have to use two cycles to read?
On 23 May, 17:28, Mike Treseler <[email protected]> wrote:
> Zhi wrote:
> > I want to read data from a RAM. When I simulate it in Modelsim, I
> > found some data output is "XX..XX". Is that mean my data unknown?
>
> That's probably the right answer.
> The testbench has to do a write cycle
> to the ram before it does a read cycle.
>
> -- Mike Treseler
My RAM is a dual port RAM. There are already data in the RAM. I point
to one specific address when I need its data. Cannot it be read in one
cycle? Do you mean in testbench we have to use two cycles to read?
On 23 May, 17:28, Mike Treseler <[email protected]> wrote:
> Zhi wrote:
> > I want to read data from a RAM. When I simulate it in Modelsim, I
> > found some data output is "XX..XX". Is that mean my data unknown?
>
> That's probably the right answer.
> The testbench has to do a write cycle
> to the ram before it does a read cycle.
>
> -- Mike Treseler