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RESET phases in C6713

Started by vbehravan January 22, 2005


As mentioned in TMS320C6713 datasheet, it has a three phase RESET and
in phase2(Internal RESET) ECLKOUT Signal will be CLKIN frequency
divide-by-8. Since in Our Circuit DSP is in HPI bootloading mode,
after RESET, ECLKOUT must remain at CLKIN/8 untill bootloading
terminate and then ECLKOUT will be CLKIN/2 (by default).
but when we reset the circuit from first, ECLKOUT is CLKIN/2!!
anyhbody can help us?!!



V Behravan-

> As mentioned in TMS320C6713 datasheet, it has a three phase RESET and
> in phase2(Internal RESET) ECLKOUT Signal will be CLKIN frequency
> divide-by-8. Since in Our Circuit DSP is in HPI bootloading mode,
> after RESET, ECLKOUT must remain at CLKIN/8 untill bootloading
> terminate and then ECLKOUT will be CLKIN/2 (by default).
> but when we reset the circuit from first, ECLKOUT is CLKIN/2!!
> anyhbody can help us?!!

It does sound like a discrepancy... but I want to ask you a question: why
do you need CLKIN/8 during HPI boot? Clock speed is irrelevant to HPI
transfer speed, since HPI is a target interface and rate is controlled by
external processor (master).

If the issue is that SDRAM is not initialized yet, and you are moving code
directly to SDRAM, then I might suggest that you first bootload a small
piece of code, let it run and initialize SDRAM and set ECLKOUT rate, then
finish loading remainder of code.

-Jeff