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DP83821 Datasheet(PDF) 71 Page - National Semiconductor (TI) |
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DP83821 Datasheet(HTML) 71 Page - National Semiconductor (TI) |
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71 / 86 page  71 www.national.com 4.0 Register Set (Continued) 4.2.41 TBI Auto-Negotiation Link Partner Ability Register This register contains the advertised ability of the link partner. The bit definitions are a direct representation of the link partner’s base page. The value of this register is valid after successful completion of auto-negotiation or when a new base page has be received as indicated by bit 6 of the Auto-Negotiation Expansion Register. 13-12 RF2, RF1 Remote Fault Read-only bits indicating that a fault or error condition has occurred. The default value is 00. 00 - No error, Link OK 10 - Offline 01 - Link Failure 11 - Auto-Negotiation Error 11-9 unused - returns 0 8-7 PS2, PS1 Pause Capability Encoding PS1 indicates that the device is capable of providing symmetric PAUSE functions. PS2 indicates that asymmetric PAUSE operation is supported. The value of PS1 when PS2 is set indicates the direction PAUSE frames are supported for flow across the link. Asymmetric PAUSE configuration results in independent enabling of the PAUSE receive and PAUSE transmit functions for PAUSE configuration resolution. 00 - No PAUSE 10 - Asymmetric PAUSE Toward Link Partner 01 - Symmetric PAUSE 11 - Both Symmetric PAUSE and Asymmetric PAUSE Toward Local Device. 6 HALF_DUP Half Duplex When set to 1, advertises half duplex capability. 5 FULL_DUP Full Duplex When set to 1, advertises full duplex capability. 4-0 unused - returns 0 Tag: TANLPAR Size: 32 bits Hard Reset: 00000000h Offset: 00ECh Access: Read Only Soft Reset: 00000000h bit tag description usage 15 NP Next Page Exchange Required Read-only. Indicates that the link partner has a next page to transmit. 14 ignore on read - internal use only 13-12 RF2,RF1 Read-only. Indicates remote fault status of the link partner. 11-9 unused - returns 0 8-7 PS2, PS1 Read-only. Indicates the PAUSE capability of the link partner. 6 HALF_DUP Read-only. Link partner is half duplex capable. 5 FULL_DUP Read-only. Link partner is full duplex capable 4-0 unused - returns 0 |
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