Somebody recently told me something that others might find helpful.
When you use ISERDES in master/slave configuration to receive bits, you don't have a phase detector, or any other way to work out if you are sampling at the optimal time.
However, if you don't use a master/slave configuration, you can use two ISERDES blocks to sample the same incoming signals - each with their own separately adjustable IDELAY block. You can then adjust the input delay to identify where the transitions signal are.
The downside is that you can't process larger symbols - if you want to process 10-bit symbols you need to make a 'gear box' to accept ten 8-bit works, and emits eigth 10-bit words to the rest of the design.
I might give this a test on my HDMI design when I get some free time...
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hamster
Somebody recently told me something that others might find helpful.
When you use ISERDES in master/slave configuration to receive bits, you don't have a phase detector, or any other way to work out if you are sampling at the optimal time.
However, if you don't use a master/slave configuration, you can use two ISERDES blocks to sample the same incoming signals - each with their own separately adjustable IDELAY block. You can then adjust the input delay to identify where the transitions signal are.
The downside is that you can't process larger symbols - if you want to process 10-bit symbols you need to make a 'gear box' to accept ten 8-bit works, and emits eigth 10-bit words to the rest of the design.
I might give this a test on my HDMI design when I get some free time...
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