topic MPC8360 boot after HRESET in Other NXP Products

MPC8360 boot after HRESET

Willow — Mon, 10 Nov 2008 23:07:48 GMT

We have a problem with HRESET.

The system load the config words RCWHR (xB4600002) and RCWLR (x04030005) onto the local bus after POReset, This works fine and we have no problems with it.

However if we assert HRESET (from the watchdog) it goes through the same sequence but does not boot.

SRESET is also fine.

any ideas.

Regards

Willow

Re: MPC8360 boot after HRESET

hw_engineer — Wed, 26 Nov 2008 18:36:37 GMT

We also have a problem with booting from local bus. The Core is freezed after loading the config words.

Are you sure that your flash is properly out of reset and all timings are fulfilled? Some flash need up to 35µs to come out of reset...

Re: MPC8360 boot after HRESET

Willow — Fri, 28 Nov 2008 18:15:34 GMT

Would the Flash Timing be any different to the reponse after POReset?

We have no problem with POReset or SReset, just HReset.

Re: MPC8360 boot after HRESET

hw_engineer — Mon, 01 Dec 2008 20:10:53 GMT

I don´t know your exact reset sequence so i can guess only.

POReset: processor and everthing else powers up --> enough start up time for flash
HReset: 16 clock cycles are to short to reset your flash and to be ready to serve RCW
SReset: no problem cause no flash reset is caused?!

these are only some ideas...