Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R Transceiver Registers (BCM5906/BCM5906M) Page 490
LP Advertise Bits
Bits 9:5 of the Link Partner Ability register reflect the abilities of the link partner. A 1 on any of these bits indicates that the
link partner is capable of performing the corresponding mode of operation. Bits 9:5 are cleared any time auto-negotiation is
restarted or the PHY is reset.
LP Selector Field
Bits 4:0 of the Link Partner Ability register reflect the value of the link partner’s selector field. These bits are cleared any time
auto-negotiation is restarted or the chip is reset.
Auto-negotiation Expansion Register
Parallel Detection Fault
Bit 4 of the Auto-Negotiation Expansion Register is a read-only bit that gets latched high when a parallel detection fault
occurs in the Auto-Negotiation state machine. For further details, consult the IEEE standard. The bit is reset to 0 after the
register is read, or when the chip is reset.
Link Partner Next Page Able
Bit 3 of the Auto-Negotiation Expansion Register returns a 1 when the link partner has Next Page capabilities. It has the
same value as bit 15 of the Link Partner Ability Register.
Next Page Able
The PHY core Returns 1 when bit 2 of the Auto-Negotiation Expansion Register is read indicating that it has Next Page
capabilities.
Page Received
Bit 1 of the Auto-Negotiation Expansion Register is latched high when a new link code word is received from the link partner,
checked, and acknowledged. It remains high until the register is read, or until the chip is reset.
Table 543: Auto-Negotiation Expansion Register (Address 06d, 06h)
Bit Name R/W Description Default
15:5 Reserved - - 000h
4 Parallel Detection Fault RO
LH
1 = Parallel detection fault.
0 = No parallel detection fault
0
3 Link Partner Next Page
Able
RO 1 = Link partner has Next Page capability
0 = Link partner does not have Next Page capability
0
2 Next Page Able RO 1 = Next Page able 1
1 Page Received RO 1 = New page has been received
0 = New page has not been received
v
0 Link Partner Auto-
Negotiation Able
RO
LH
1 = Link partner has auto-negotiation capability
0 = Link partner does not have auto-negotiation capability
0
R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear after read
operation. Use default values of reserved bit(s) when writing to reserved bit(s).
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