RTL8019AS datasheet(45/50 Pages) ETC1

45 / 50 page

8019AS.doc

2001-05-10

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SPECIFICATION

RTL8019AS

(4) To Test Cable Connection

q There are four physical medium types in RTL8019.

We perform loopback mode 3 to test the cable connection status.

s set RCR=00h to accept physical packet

s set PAR0-5 to accept packet

s set TCR=06h (CRC enabled)

s set DCR=40h (8-bit slot) or 43h (16-bit slot)

s clear ISR

s tx a packet

s check TSR after loopback

A. 10Base2

If cable OK, get TSR=03h (Tx OK).

If cable FAIL, get TSR=0Eh (Collision and Tx aborted).

B. 10Base5

If cable OK, get TSR=03h (Tx OK).

If MAU connected but cable FAIL, get TSR=0Eh (Tx collision and Tx aborted).

If MAU not connected, get TSR=53h (Carrier sense is lost during transmission and CD heartbeat

fails.).

C. 10BaseT with link test disabled

RTL8019AS disables link test in this case, so cable OK or FAIL doesn't affect TSR; get TSR=03h.

D. Auto-detection (10BaseT with link test enabled)

RTL8019AS automatically switches from 10BaseT to 10Base 2 if the twisted-pair wire is not

connected (10BaseT link test fails).

If twisted-pair wire OK, get TSR=03h (Tx OK) & BNC=0 in CONFIG2

If twisted-pair wire FAIL but coaxial cable OK, get TSR=03h (Tx OK) & BNC=1 in CONFIG2

Otherwise, get TSR=0Eh (same as 10Base2 connection fail).

RTL8019AS Datasheet(PDF) 45 Page - List of Unclassifed Manufacturers