Datasheet

Micrel, Inc. KS8721BL/SL
June 2009
23
M9999-062509-1.3
Address Name Description Default
(1)
Mode
1b.3
Link Partner
Acknowledge Interrupt
1 = Link partner acknowledge occurred
0 = Link partner acknowledge has not occurred
RO/SC 0
1b.2 Link Down Interrupt
1 = Link down occurred
0 = Link down has not occurred
RO/SC 0
1b.1 Remote Fault Interrupt
1 = Remote fault occurred
0 = Remote fault has not occurred
RO/SC 0
1b.0 Link Up Interrupt
1 = Link up interrupt occurred
0 = Link up interrupt has not occurred
RO/SC 0
Register 1fh - 100BASE-TX PHY Controller
1f.15:14 Reserved RO 0
1f.13 Pairswap Disable
1 = Disable MDI/MDI-X
0 = Enable MDI/MDI-X
RW 0
1f.12 Energy Detect
1 = Presence of signal on RX+/RX- analog wire pair
0 = No signal detected on RX+/RX-
RO 0
1f.11 Force Link
1 = Force link pass
0 = Normal link operation
This bit bypasses the control logic and allow transmitter to
send pattern even if there is no link.
RW 0
1f.10 Power-Saving
1 = Enable power-saving
0 = Disable
RW 1
1f.9 Interrupt Level
1 = Interrupt pin active high
0 = Active low
RW 0
1f.8 Enable Jabber
1 = Enable jabber counter
0 = Disable
RW 1
1f.7 Auto-Negotiation Complete
1 = Auto-negotiation complete
0 = Not complete
RW 0
1f.6
Enable Pause
(Flow-Control Result)
1 = Flow control capable
0 = No flow control
RO 0
1f.5 PHY Isolate
1 = PHY in isolate mode
0 = Not isolated
RO 0
1f.4:2 Operation Mode Indication
[000] = Still in auto-negotiation
[001] = 10BASE-T half-duplex
[010] = 100BASE-TX half-duplex
[011] = Reserved
[101] = 10BASE-T full-duplex
[110] = 100BASE-TX full-duplex
[111] = PHY/MII isolate
RO 0
1f.1 Enable SQE Test
1 = Enable SQE test
0 = Disable
RW 0
1f.0 Disable Data Scrambling
1 = Disable scrambler
0 = Enable
RW 0
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 “Strapping Options.”