Re: Hardware problems with DS80C400

Anders Nielsen wrote:
> We are currently building our own Tini hardware based upon the reference
> design from Dallas. We have established communication with the board and
> have the received greetings from the autoloader 1.0.1. However we are
> having problems with downloading the firmware. We have narrowed the
> problem down to inactive CE pins. When trying a command like F 00 or D 0
> 100 there is no activity on the CE0 pin. There are however activity on the
> WR, address and data pins as expected. 
> Have anybody experienced similar problems? We would prefer not to change
> the MCU if possible.... The MUX pin is hardwired to VCC..
>
> Any comment would be appreciated
>
> Anders Nielsen

Anders,

I think that some other chip enable besides /CE0 is firing.  Use the B 
command to select the upper byte of the address.  For instance.

B 0      // set address to 0x00####
d 0 100  // dump addresses 0x000000 through 0x000100, /CE0 should fire

See if this helps.

The loader sets the CPU up defaulting to 2MB memory ranges, so the starting 
address for each chip enable will be:

/CE0 - 0x000000
/CE1 - 0x200000
/CE2 - 0x400000
/CE3 - 0x600000
/CE4,/CE7 - etc.

-Bryan

--
--
Bryan Armstrong
bryan.armstrong-6tN4nzCoH/hBDgjK7y7TUQ@xxxxxxxxxxxxxxxx


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