Micrel, Inc.
KSZ9021RL/RN
Mode(1)
Address
Name
Description
Default
15.14
1000Base-X
Half-duplex
1 = PHY able to perform 1000Base-X
half-duplex
RO
0
0 = PHY not able to perform 1000Base-X
half-duplex
15.13
15.12
1000Base-T
Full-duplex
1 = PHY able to perform 1000Base-T
full-duplex 1000BASE-X
0 = PHY not able to perform 1000Base-T
full-duplex
RO
RO
RO
1
1
-
1000Base-T
Half-duplex
1 = PHY able to perform 1000Base-T
half-duplex
0 = PHY not able to perform 1000Base-T
half-duplex
15.11:0
Reserved
Ignore when read
Note:
1. RW = Read/Write.
RO = Read only.
SC = Self-cleared.
LH = Latch high.
LL = Latch low.
Vendor Specific Registers
Mode(1)
Address
Name
Description
Default
Register 17 (11h) – Remote Loopback, LED Mode
17.15:9
17.8
Reserved
RW
RW
0000_001
0
Remote
Loopback
1 = Enable Remote Loopback
0 = Disable Remote Loopback
17.7:6
17.5:4
17.3
Reserved
Reserved
RW
RW
RW
11
11
0
LED Test
Enable
1 = Enable LED test mode
0 = Disable LED test mode
17.2:1
17.0
Reserved
Reserved
RW
RO
00
0
Register 18 (12h) – LinkMD® – Cable Diagnostic
18.15
Reserved
Reserved
Reserved
RW/SC
RW
0
18.14:8
18.7:0
000_0000
0000_0000
RO
Register 19 (13h) – Digital PMA/PCS Status
19.15:3
19.2
Reserved
RO/LH
RO
0000_0000_0000_0
0
1000Base-T
Link Status
1000 Base-T Link Status
1 = Link status is OK
0 = Link status is not OK
M9999-101309-1.1
October 2009
41
MICREL [ MICREL SEMICONDUCTOR ]
