IP1001-DS-R02 datasheet(23/48 Pages) ETC2

23 / 48 page

IP1001 LF

Data Sheet

23/48

Dec. 18, 2007

IP1001-DS-R06

3.7

Auto-Negotiation

IP1001 will performs Auto-Negotiation automatically if one of the following conditions happened:

1) Power up reset, hardware reset, or software reset (by programming MII register 0.15).

2) Restart Auto-Negotiation (by programming MII register 0.9).

3) Transition from power down to power up (by programming MII register 0.11).

4) Link is down.

Once Auto-Negotiation is initiated, IP1001 sends out the appropriate base pages/ next pages to advertise its

capability and negotiate with the link partner to determine speed, duplex, and master/slave. Note that IP1001

handles the base page/ next page exchanges automatically without user intervention. To link at giga mode,

the link partner of IP1001 has to support Auto-Negotiation, too. Once IP1001 completes Auto-Negotiation it

updates the statuses in registers 1, 5, 6, 10 and 17. The advertised abilities can be changed by writing

registers 4 and 9. It is noted that a write access to register 4 or 9 has no effect once the IP1001 begins

transmitting Fast Link Pulses (FLPs). This guarantees that the transmitted FLPs are consistent. Register 7 is

treated in a similar way as registers 4 and 9 during additional next page exchanges.

If the link partner doesn’t support Auto-Negotiation, IP1001 determines the link speed using parallel detection

and the link result is either 10M half duplex or 100M half duplex. Please refer to IEEE 802.3 clause 28 and 40

for more detailed description of Auto-Negotiation.

Auto-Negotiation can be disabled by programming register 0.12. When Auto-Negotiation is disabled, the

speed and duplex of IP1001 can be changed by programming registers 0.13, 0.6 and 0.8, respectively.

IP1001-DS-R02 数据表(PDF) 23 Page - List of Unclassifed Manufacturers