Hello group,
Need some support from u people .....
We are trying to connect 89c51 8-bit controller to Realtek Ethernet controller RTL8019AS. No external RAM is been used. We have used Packet Wacker (Ethernet board) available from
This is how we have connected....
1). SA0-SA4 connected to PORT2 - P2.0-P2.4 2). SD0-SD7 connected to PORT0 - P0.0-P0.7 3). INT0 connected to INT0 - P3.2 4). IOWB connected to WR - P3.6 5). IOWR connected to RD - P3.7 6). AEN tied to VCC 7). JP tied to VCCTo start with we tried to read the register 0x0A which contains the Chip ID...but in vain. All we could read was 0xFF.
Also tried to write to the CR register with 0x21...and read from it. Again wasn't able to read the correct value. what we read was 0xFF.
- How could we check our Realtek chip...?
- Is it proper to read the NIC's register without initialising it?
- Or do we require to recheck our connection....as the board (Packet Wacker) comes with only few pins "out" for connection.
Thx in advance...
Lawrie Kurian