Hi,

I am trying to speed up my FX2 firmware and trying to clean up the code. I found that SYNCDELAY macro is used very often in my code and also in firmware examples given by Cypress. For example, code below is taken from C:\Cypress\Cypress Suite USB 3.4.7\Firmware\Bulkloop\bulkloop.c

  ...
  EP2CFG = 0xA2;
  SYNCDELAY;                    
  EP4CFG = 0xA0;
  SYNCDELAY;                    
  EP6CFG = 0xE2;
  ...

As far as I understand from TRM sections 15.15, such a delay should be used in situation when you write some register A then read/write other register B and register B depends in some way on register A. This delay just gives a time for internal hardware to "catch" new value & update all others that depend on it.

So in the given example because we only write registers, there is no need for such delays, right? Please correct me if I am wrong.

Best regards, Arturas

 Hallo,

        Yes, here no delays are required.

  EP2CFG = 0xA2;   SYNCDELAY;                       EP4CFG = 0xA0;   SYNCDELAY;                       EP6CFG = 0xE2;    But keep in mind delay is required between a write to any register in  the 0xE600-0xE6FF range and a write to one of the registers in Table 15-20 of TRM.

Thanks

Prajith

 Hallo,

        Yes, here no delays are required.

      EP2CFG = 0xA2;SYNCDELAY; EP4CFG = 0xA0; SYNCDELAY; EP6CFG = 0xE2;

But keep in mind delay is required between a write to any register in  the 0xE600-0xE6FF range and a  write to one of the registers in Table 15-20 of TRM.  Thanks, Prajith