KSZ8721B Micrel Inc, KSZ8721B Datasheet - Page 17

• Manufacturer Part Number: KSZ8721B
• Description: IC TXRX PHY 10/100 2.5V 48-SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721B

• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Data Rate: 100Mbps
• Supply Voltage Range: 2.375V To 2.625V
• Logic Case Style: SSOP
• No. Of Pins: 48
• Operating Temperature Range: 0°C To +70°C
• Msl: MSL 2 - 1 Year
• Ic Function: Transceiver IC
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1627 - BOARD EVALUATION FOR KSZ8721BMC576-1626 - BOARD EVALUATION FOR KSZ8721BL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1026-5; 576-1510-5; 576-1510-5; KSZ8721B

Register Map
Note 1.
April 2005
KS8721B/BT
Address
Register 0h - Basic Control
0.15
0.14
0.13
0.12
0.11
0.10
0.9
0.8
0.7
0.6:1
0.0
Register 1h - Basic Status
1.15
1.14
1.13
1.12
1.11
Register No.
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.”
15h
1bh
1fh
0h
1h
2h
3h
4h
5h
6h
7h
8h
Reserved
Transmitter
Reset
Loop-back
Speed Select (LSB)
Auto-Negotiation Enable
Power Down
Isolate
Restart Auto-Negotiation
Duplex Mode
Collision Test
Disable
100BaseT4
100BaseTX Full Duplex
100BaseTX Half Duplex
10BaseT Full Duplex
10BaseT Half Duplex
Name
Description
Basic Control Register
Basic Status Register
PHY Identifier I
PHY Identifier II
Auto-Negotiation Advertisement Register
Auto-Negotiation Link Partner Ability Register
Auto-Negotiation Expansion Register
Auto-Negotiation Next Page Register
Link Partner Next Page Ability
RXER Counter Register
Interrupt Control/Status Register
100BaseTX PHY Control Register
Description
1 = software reset. Bit is self-clearing
1 = loop-back mode; 0 = normal operation
1 = 100Mbps; 0 = 10Mbps
Ignored if Auto-Negotiation is enabled (0.12 = 1)
1 = enable auto-negotiation process (override 0.13 and 0.8)
0 = disable auto-negotiation process
1 = power down mode; 0 = normal operation
1 = electrical isolation of PHY from MII and TX+/TX-
0 = normal operation
1 = restart auto-negotiation process
0 = normal operation. Bit is self-clearing
1 = full duplex; 0 = half duplex
1 = enable COL test; 0 = disable COL test
0 = enable transmitter
1 = disable transmitter
1 = T4 capable; 0 = not T4 capable
1 = capable of 100BaseX full duplex
0 = not capable of 100BaseX full duplex
1 = capable of 100BaseX half duplex
0 = not capable of 100BaseX half duplex
1 = 10Mbps with full duplex
0 = no 10Mbps with full duplex capability
1 = 10Mbps with half duplex
0 = no 10Mbps with half duplex capability
17
Mode
RW/SC
RW
RW
RW
RW
RW
RW/SC
RW
RW
RO
R/W
RO
RO
RO
RO
RO
(Note 1)
Default
0
0
Set by
SPD100
Set by
NWAYEN
0
Set by ISO
0
Set by
DUPLEX
0
0
0
0
1
1
1
1
M9999-041405
Micrel, Inc.