fast to slow clock asynchronous fifo

[kuttu]

Hi,

If I have to use an asynchronus fifo were write clk is 150 Mhz and read clock is 100Mhz. Do I need to strecth my write pointer width before giving it to the Readclk synchronizer.

Thanks
Ajith

 

[shaiko]

What do you mean in: "strecth" ?

 

[kuttu]

What do you mean in: "strecth" ?

Sorry there is a small error in the question write clock is 150 and read clock is 100 mhz.

So if i write countinously for 3 clock cycles my write pointer will be incremented 3 times . That means my write pointer will change in every wclk cycle which is faster. So when this write pointer is given for synchronization to the read clk domainit will not detect the write pointer correctly because the widthof the wptr is less than the rdclk width.so my query is do i need to stretch the width ofthe writepointer so thatitremains unalterred for 1 full rdclk cycle

 

[mail4idle2]

use grey coding for write pointer.