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Thank your reply. I used ModelPrim in DSP Advanced Builder. There is not register unit as I know. Now I used dualmem (ram) to save these variables and access them as you said. But it is hard to compute the delay and to set multiple mux to satisfy different access. So I want to find a more efficient way to restore the variables.
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There is sample delay unit (in effect a register) but it has no enable port so I suggested using a mux to apply enable. It should work and data would be written within one clock (set sample delay to 1). It can be read anytime.
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