MOD5270 Internal Reset Circuitry

[anidea]

What does the reset circuit look like on the MOD5270 pcb? Is there a reset chip or does the line go directly to the CF?

I wish to drive the reset in line with a slow RC while I implement a 'Linksys Reset' type circuit (hold the button) and I want to be sure the signal will be cleaned up before it hits the actual CF chip.

Thanks,

Gabriel

[lgitlitz]

The MCF5270 has its own internal reset controller. The RSTI signal is routed to pin N13(reset in) of the processor, J1[28], and J3[7] (the BDM header). It also is connected to a 4.7K pull-up resistor. The RSTO signal comes from the processor pin P13 and goes to the Ethernet PHY, a boot configuration latch, and J1[30].
The only electrical specifications you should be worried about are RSTI of the MCF5270. Take a look at the following document:
C:\nburn\docs\FreescaleManuals\MCF5271EC.pdf

-Larry

[pbreed]

We have implemented exactly that kind of circuit for the SB700EX (5270 baseD) and it works just fine.

[anidea]

Thank you kindly. I've attached my schematic for the reset generator. Any suggestions?

[pbreed]

I think the MOD5270 already has a 4.7K pullup.What you show should work.

Paul