[En-Nut-Discussion] Memory error with second RTL8019

[Stefan Richter]

After my MCU is running again, I have got another problem: I try to use two 
network ports. Therefor I connected a RTL8019AS NIC to the Ethernut's bus 
as Jochen Beck explained. The only thing I changed is that A15 is not 
connected to the address bus but to PD5. The port is set high since I think 
is the case at the Ethernut's RTL when the RAM is accessed.

Well, it doesn't work: Running basemon there is a memory error at 1301. 
What strikes me: I put the card to 0x300 with its jumpers since Jochen 
posted some months ago what he wrote this address to the EEPROM 
(http://www.egnite.de/pipermail/en-nut-discussion/2002- 
November/000260.html). The most significat bits of 0x300 match with 1301 
and 1301 is the first address where the external RAM is accessed and this 
is the case. And what's really strange: PD5 doesn't matter. It can be 0,2 V 
or 4,85 V, but the problem is the same...

I already checked all wires and their connection to the ISA board several 
times, but they are alright. And everything I found for the RTL8019AS seems 
to say: "It must work"

What I am thinking about: Is the NIC ignoring the higher address bits? Is 
it reading the EEPROM even if jumpers are set? If yes, does anybody has the 
programm to change the EEPROM? Though I compared the schematic of the 
Ethernut with the NIC as far as possible: Is there anything special in the 
use at the Ethernut?


Thanks

Stefan