82503 datasheet(15/45 Pages) INTEL

15 / 45 page

82503

290421 – 6

Figure 7 Polarity Fault State Diagram

polarity error due to crossed wires If Pin 4 of the

82503 is high and the TPE receive pins are re-

versed the 82503 will correct the error by reversing

the signals internally and turn POLED on (low) to

indicate that the fault has been detected and cor-

rected The polarity correction function is defeatable

by driving the APOLXSQ input low However the

polarity fault will continue to be indicated on the

POLED

312 Controller Interface

Connecting the 82503 to one of the Intel Ethernet

controllers (82586 82590 82593 82596) requires

no additional components Simply drive CS0 and

CS1 both low and connect TxC TxD RTS RxC

RxD CRS CDT and LPBK to the corresponding

controller pins

The 82503 also works with other Ethernet control-

lers without additional components including the

National Semiconductor 8390 and 83932 (SONIC)

Western Digital 83C690 Fujitsu 86950 (Etherstar)

depending on the state of and CS0 and CS1 inputs

The interface of the 82503 to the AMD 7990

(LANCE) requires external logic to control the LPBK

pin of the 82503 Note that when an AMD LAN con-

troller is used to interface to the 82503 the LPBK

pin of the 82503 becomes active high That is the

82503 enters diagnostic loopback mode when LPBK

pin is high and is in normal operation mode when

LPBK pin is low

The logic sense of the 82503 controller pins will

change and should be connected to the controller

pins according to the following table

82503 Datasheet(PDF) 15 Page - Intel Corporation