[En-Nut-Discussion] rtl8019as

[Matt Bell]

Hi,

Thanks for the quick responses...

This is the situation, I have the realtek controller wired similar to
the ethernut 1.3D schematic but cant seem to get it to work properly,
let me know if you see something wrong with the following connections
ive made to the controller.

INT0 to AVR through an intverter
RSTDRV connected to a reset switch
SMEMWB, SMEMRB, JP tied to Vdd
AEN, IOCS16B tied to GND
Address/data bus's connected to the controller

connection to port 77 BD7/EEDO is the only one im not making because im
not 100% sure what is going on there

when i run the test program tcps i'm able to connect to it every now and
then very inconsistantly, and not for every long before connection is
lost. However while messing with the realtek controller i had Vdd which
is tied to SMEMWB, SMEMRB, and JP up to 7-8volts and the controller
started working like a charm.  

Any Ideas?
-Matt


On Fri, 2004-11-26 at 03:48, Henrik Maier wrote:
> Hi Matt!
> 
> I have worked with several designs involving the RealTek chip.
> 
> AEN must be low as mentioned in RealTek's data sheet for NIC register 
> access.
> 
> IOCS16B is an input during reset then becomes an open drain output.
> 
> IOCS16B MUST be at a logic low level for 8 bit designs during reset. 
> Refer to RealTek data sheet.
> 
> IOCS16B is usually tied to ground via a 27K resistor. However one can 
> spare the resistor and tie it directly to GND because after reset it 
> becomes an open drain output. The 27K resistor is a legacy of the PC's 
> ISA bus.
> 
> Here is a quote from RealTek's support on this matter:
> "Q: Does IOCS16B need to be connected or can it be left open (no ISA
> bus available)?
> A:  I suggest you could pull high 300 Ohm and pull low 27K in IOCS16B.
> "
> 
> 
> Regards
> 
> Henrik Maier