Micrel, Inc.
KSZ9021RL/RN
Register Number (Hex)
8 (8h)
Description
Auto-Negotiation Link Partner Next Page Ability
1000Base-T Control
9 (9h)
10 (Ah)
1000Base-T Status
11 (Bh)
Extended Register – Control
Extended Register – Data Write
Extended Register – Data Read
Reserved
12 (Ch)
13 (Dh)
14 (Eh)
15 (Fh)
Extended – MII Status
Vendor Specific Registers
16 (10h)
Reserved
17 (11h)
Remote Loopback, LED Mode
LinkMD® – Cable Diagnostic
Digital PMA/PCS Status
Reserved
18 (12h)
19 (13h)
20 (14h)
21 (15h)
RXER Counter
22 (16h) – 26 (1Ah)
27 (1Bh)
Reserved
Interrupt Control/Status
Digital Debug Control 1
Reserved
28 (1Ch)
29 (1Dh) – 30 (1Eh)
31 (1Fh)
PHY Control
Extended Registers
256 (100h)
257 (101h)
258 (102h)
259 (103h)
260 (104h)
261 (105h)
263 (107h)
Common Control
Strap Status
Operation Mode Strap Override
Operation Mode Strap Status
RGMII Clock and Control Pad Skew
RGMII RX Data Pad Skew
Analog Test Register
Register Description
IEEE Defined Registers
Mode(1)
Address
Name
Description
Default
Register 0 (0h) – Basic Control
0.15
0.14
Reset
1 = Software PHY reset
RW/SC
0
0 = Normal operation
This bit is self-cleared after a ‘1’ is written to it.
1 = Loop-back mode
Loop-back
RW
0
0 = Normal operation
M9999-101309-1.1
October 2009
34
MICREL [ MICREL SEMICONDUCTOR ]
