how to initialize mipi rffe slave? set_input_delay

[billylee]

hi everyone~
I need your help.

I'm a newbie in the dc_shell, but I have question about set_input_delay.

rffe_slave or any other interface need to be initialized.
they said "please use SSC" signals that is data line.

rffe has only 2-wire.

generally SDATA generated from SCLK clock,
so I did write dc_script like this,

create_clock -name "sclk" -p 20 [get_ports sclk]
set_input_delay 1 -clock sclk [all_inputs]
set_output_delay 1 -clock sclk [all_outputs]

In this case,
Q1. How can I initialize RFFE protocol?
Q2. is it possible to sample SCLK with SDATA for initializing?
I'm trying to sample SCLK=1 when SDATA rising edge.
And how to make setup/hold time for this?


Thanks.

 

[billylee]

Hi everyone

I'll use different Input Pad for SDATA and SCLK.
I think SCLK can be sampled with SDATA. because they have different delay time.
If you have any good idea, please let me know.

Thanks
billy

 

[slutarius]

Ｈｉ，

For this interface, I assume that SCLK is a clock port, SDATA is a data port.
It seems that you had made some thing OK with the constraint:

"create_clock -name "sclk" -p 20 [get_ports sclk]
set_input_delay 1 -clock sclk [all_inputs]
set_output_delay 1 -clock sclk [all_outputs]"

Amount of input delay value can be around 50% of clock period and actually depended on the source FF that generate SDATA, and the connection before arriving to your module.