Clocking blocks in generate statement

sg8 · Newbie Joined: Apr 17, 2012 Posts: 2

I have an interface which is having N number of clock inputs, here N is a parameter.
So I tried writing clocking block inside generate statement

dave_59 · Posted: Tue Apr 17, 2012 1:09 pm **Post subject:**

There are several problems in the way you are trying to use a clocking block with a generate loop.

The biggest problem is that you are not allowed to access generated block names with a variable index. So any reference to driver_cb[i] is not legal when i is a variable. It must be a genvar variable or a parameter that results in a constant expression. This is probably a showstopper fr trying to use a clocking block with an array of clocks.

The syntax problem is simple to fix, but will not help the first problem. You are only allowed to list simple identifiers as input or outputs of the clocking block. You could do

Ajeetha · Posted: Tue Apr 17, 2012 10:18 pm **Post subject:**

Adding further to Dave's thoughtful language reply, your best bet would perhaps be use generate-interface combination. i.e. define your interface per-bit/lane and declare an array of them via generate. Something like:

sg8 · Newbie Joined: Apr 17, 2012 Posts: 2

Thanks Dave & Ajeetha,

Interface has got more signals(other clock& data signals), the code shown here is simplified and all data inputs to DUT are driven by a driver. Only clk, data_in & data_out signals are parameterized here.
Using generate-interface combination will split up interface to many & I need to pass multiple interfaces to a driver or I need to have N drivers for N interfaces.