following problem exists:
board with ADSP-21369 and W5300; transformer Wuerth 749013010 (meets exactly your spec)
W5300 in internal PHY mode (Test-mode = 0000); OP-mode = 000 or 111;
OPEN socket0 in UDP mode (S0_SSR response ok); try to broadcast data
Result: internally, command SEND (or SEND_MAC) is finalized with SEND_OK interrupt; TX_LED is active; but:
- external pins TXOP, TXON (and RXIP, RXIN) do not carry any voltage (< 10 mV, but there is NO short-cut to GND)
- LINK_LED is not active (and there is really no link)
Switching OP-mode from 000 to 111 increases duration interval between command SEND and Interrupt SEND_OK by factor 13 (in OP-mode 000, duration is 5µs/8 Byte user data, corresponding to about 1Byte/100ns);
but on the outside TXO and RXI pins - no voltage, no link, all the same.
Do you have an idea, what prevents the voltage activation (should be in the order of 1.6V dc) of these PHY pins?
Kind regards, Wolfgang.