karthikbalaguru wrote:
On Nov 6, 9:56 pm, LittleAlex <alex.lo... at (no spam) email.com> wrote:
On Nov 5, 2:14 pm, karthikbalaguru <karthikbalagur... at (no spam) gmail.com
wrote:
Hi,
Is it possible that a port of aRGMIIinterface
can work properly only for Rx(Receiving data) and not
for Tx(Transmitting data).
Yes. Especially if TxC is bad.
That is, whenever there is a problem/damage in
aRGMIIinterface, will it stop doing both reception
and transmission ?
Damage? Odd choice of words. But anything is possible; you need to
understand the software too.
The same software is working fine in another board
withRGMIIinterface. The problematic board
is able to receivethe packets but it is not transmitting any
packets. Initially suspected some setup configurations
and software, but it does not look like it. ARP entries,
the MAC addresses and IP addresses etc look fine.
Get the data sheet, a logic analyzer, a good software debugger and a
packet sniffer.
Using Wireshark(Ethereal) analyzer to log the packets
& to track the request-response flows.
Need to check if there is any specific register available
withRGMIIinterface that would convey if it is really sending
(transmitting) the packets out before deciding on this.
Lemme know if you have any tricks/ideas.
Be sure that you are transmitting a good (valid) packet. I was using
Wireshark for a very similar test and if the packet is not value, the
interface receiving it will throw it away without passing it up to
Wireshark.
I also had problems with a network switch not delivering the data to the
connection that the Wireshark machine was on, so the data was going onto the
network, but Wireshark didn't get it.
Also check the the tx_en and tx_er signals are good. The MAC might be
transmitting without the PHY sending on the data.
