KSZ9021GN TR Micrel Inc, KSZ9021GN TR Datasheet - Page 30

• Manufacturer Part Number: KSZ9021GN TR
• Description: Specifications: Number of Drivers/Receivers: 8/8 ; Type: Transceiver ; Voltage - Supply: 3.135 V ~ 3.465 V ; Package / Case: 64-VFQFN Exposed Pad ; Packaging: Tape & Reel (TR) ; Protocol: Gigabit Ethernet ; Lead Free Status: Lead Free ; RoHS Stat
• Manufacturer: Micrel Inc

Micrel, Inc.
Register Description
IEEE Defined Registers
September 2010
Register Number (Hex)
27 (1Bh)
28 (1Ch)
29 (1Dh) – 30 (1Eh)
31 (1Fh)
Extended Registers
257 (101h)
258 (102h)
259 (103h)
263 (107h)
Address
Register 0 (0h) – Basic Control
0.15
0.14
0.13
0.12
0.11
0.10
0.9
0.8
0.7
Name
Reset
Loop-back
Speed Select
(LSB)
Auto-
Negotiation
Enable
Power Down
Isolate
Restart Auto-
Negotiation
Duplex Mode
Collision Test
Description
Interrupt Control/Status
Digital Debug Control 1
Reserved
PHY Control
Strap Status
Operation Mode Strap Override
Operation Mode Strap Status
Analog Test Register
Description
1 = Software PHY reset
0 = Normal operation
This bit is self-cleared after a ‘1’ is written to it.
1 = Loop-back mode
0 = Normal operation
[0.6, 0.13]
This bit is ignored if auto-negotiation is enabled
(register 0.12 = 1).
1 = Enable auto-negotiation process
0 = Disable auto-negotiation process
If enabled, auto-negotiation result overrides
settings in register 0.13, 0.8 and 0.6.
1 = Power down mode
0 = Normal operation
1 = Electrical isolation of PHY from GMII/MII
0 = Normal operation
1 = Restart auto-negotiation process
0 = Normal operation.
This bit is self-cleared after a ‘1’ is written to it.
1 = Full-duplex
0 = Half-duplex
1 = Enable COL test
0 = Disable COL test
[1,1] = Reserved
[1,0] = 1000Mbps
[0,1] = 100Mbps
[0,0] = 10Mbps
30
Mode
RW/SC
RW
RW
RW
RW
RW
RW/SC
RW
RW
(1)
Default
0
0
Hardware Setting
1
0
0
0
Hardware Setting
0
M9999-091010-1.1
KSZ9021GN