4.0 Registers (Continued)
4.8 AUTO-NEGOTIATION EXPANSION REGISTER (ANER)
Address 06h
Bit
15:5
4
Bit Name
Reserved
MLF
Default
0, RO
Description
RESERVED: Always 0.
0, RO/L
MULTIPLE LINK FAULT:
1 = Multiple Link Fault--indicates that it was not possible to resolve the
connection because the 10BASE-T Link Integrity Test function and/
or the 100BASE-X Link Integrity Monitor indicated a valid link yet
both or neither of these functions maintained a valid link according to
Auto-Negotiation specification. This bit generally indicates that the
receive channel is improperly functioning or improperly connected.
0 = No Multiple Link Fault
3
2
1
LP_NP_ABLE
NP_ABLE
0, RO
0, RO/P
0, RO
LINK PARTNER NEXT PAGE ABLE: Status indicating if the Link
Partner supports Next Page negotiation. A one indicates that the Link
Partner supports Next Page.
NEXT PAGE ABLE: Indicates if this node is able to send additional
“Next Pages”. The DP83840A is not Next Page Able, so this bit is always
zero.
PAGE_RX
LINK CODE WORD PAGE RECEIVED: This bit is set when a new Link
Code Word Page has been received. This bit is automatically cleared
when the Auto-Negotiation Link Partner Ability Register (ANLPAR
register 05h) is read by management.
0
LP_AN_ABLE
0, RO
LINK PARTNER AUTO-NEGOTIATION ABLE: A one in this bit
indicates that the Link Partner supports Auto-Negotiation.
4.9 DISCONNECT COUNTER REGISTER (DCR)
Address 12h
Bit
Bit Name
Default
Description
15:0
DCNT[15:0]
<0000h>, RW/SC DISCONNECT COUNTER: This 16-bit counter increments for each
disconnect event. Each time this DP83840A and its Link Partner are
disconnected from each other, the counter increments. This counter
automatically rolls over to 0000h.
4.10 FALSE CARRIER SENSE COUNTER REGISTER (FCSCR)
Address 13h
Bit
Bit Name
Default
Description
15:0
FCSCNT[15:0]
<0000h>, RW/SC FALSE CARRIER EVENT COUNTER: This 16-bit counter increments
for each false carrier event, that is, when carrier sense is asserted
without J/K symbol detection. This counter freezes when full (at FFFFh).
This counter represents the total number of false carrier events since
the last management read. The Carrier Integrity Monitor uses its own
counter to qualify whether the link is unstable.
Version A
National Semiconductor
49
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