KS8721B/BT
Micrel
Address Name
Description
Mode(Note 1) Default
1.10:7
1.6
Reserved
No Preamble
RO
RO
RO
0
1
0
1 = preamble suppression; 0 = normal preamble
1.5
Auto-Negotiation Complete 1 = auto-negotiation process completed
0 = auto-negotiation process not completed
1.4
1.3
Remote Fault
1 = remote fault; 0 = no remote fault
RO/LH
RO
0
1
Auto-Negotiation Ability
1 = capable to perform auto-negotiation
0 = unable to perform auto-negotiation
1.2
1.1
1.0
Link Status
1 = link is up; 0 = link is down
RO/LL
0
0
1
Jabber Detect
Extended Capability
1 = jabber detected; 0 = jabber not detected. Default is Low RO/LH
1 = supports extended capabilities registers RO
Register 2h - PHY Identifier 1
2.15:0 PHY ID Number
Assigned to the 3rd through 18th bits of the Organizationally RO
0022h
Unique Identifier (OUI). Micrel’s OUI is 0010A1 (hex)
Register 3h - PHY Identifier 2
3.15:10
PHY ID Number
Assigned to the 19th through 24th bits of the Organizationally RO
000101
Unique Identifier (OUI). Micrel’s OUI is 0010A1 (hex)
3.9:4
3.3:0
Model Number
Six bit manufacturer’s model number
Four bit manufacturer’s model number
RO
RO
100001
1001
Revision Number
Register 4h - Auto-Negotiation Advertisement
4.15
4.14
4.13
Next Page
Reserved
1 = next page capable; 0 = no next page capability.
1 = remote fault supported; 0 = no remote fault
RW
RO
RW
RO
RW
RO
RW
0
0
0
0
0
0
Remote Fault
4.12 : 11 Reserved
4.10
4.9
Pause
1 = pause function supported; 0 = no pause function
1 = T4 capable; 0 = no T4 capability
100BaseT4
4.8
100BaseTX Full Duplex
1 = TX with full duplex; 0 = no TX full duplex capability
Set by
SPD100 &
DUPLEX
4.7
4.6
100BaseTX
1 = TX capable; 0 = no TX capability
RW
RW
Set by
SPD100
10BaseT Full Duplex
1 = 10Mbps with full duplex
Set by
0 = no 10Mbps full duplex capability
DUPLEX
4.5
10BaseT
1 = 10Mbps capable; 0 = no 10Mbps capability
[00001] = IEEE 802.3
RW
RW
1
4.4:0
Selector Field
00001
Register 5h - Auto-Negotiation Link Partner Ability
5.15
5.14
Next Page
1 = next page capable; 0 = no next page capability
RO
0
Acknowledge
1 = link code word received from partner
0 = link code word not yet received
RO
RO
RO
0
0
0
5.13
5.12
Remote Fault
Reserved
1 = remote fault detected; 0 = no remote fault
Note 1. RW: Read/Write, RO: Read only, SC: Self clear, LH: Latch High, LL: Latch Low. Some of the default values are set by strap-in. See
“Srapping Options.”
KS8721B/BT
18
August 2003
MICREL [ MICREL SEMICONDUCTOR ]
