KS8721BL A4 Micrel Inc, KS8721BL A4 Datasheet - Page 15

• Manufacturer Part Number: KS8721BL A4
• Description: 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-LQFP
• Manufacturer: Micrel Inc

Specifications of KS8721BL A4

• Lead Free Status / Rohs Status: Not Compliant

Auto-Crossover (Auto-MDI/MDI-X)
Automatic MDI/MDI-X configuration is intended to eliminate the need for crossover cables between similar devices. The
assignment of pinouts for a 10/100 BASE-T crossover function cable is shown below.
This feature eliminates the confusion in applications by allowing the use of both straight and crossover cables. This feature
is controlled by register 1f:13. See “Register 1fh–100BASE-TX PHY Controller” section for details.
February 2005
KS8721BL/SL
Modular Connector (RJ45)
10/100 BASE-T
Media Dependent Interface
Receive Pair
Transmit Pair
(Repeater or Switch)
10/100 BASE-T
Media Dependent Interface
Transmit Pair
Receive Pair
Modular Connector
HUB
(RJ45)
NIC
Figure 1. Straight Through Cable
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Figure 2. Crossover Cable
15
10/100 BASE-T
Media Dependent Interface
Modular Connector (RJ45)
10/100 BASE-T
Media Dependent Interface
(Repeater or Switch)
Modular Connector
1
2
3
4
5
6
7
8
(Repeater or Switch)
1
2
3
4
5
6
7
8
(RJ45)
Transmit Pair
HUB
Receive Pair
Transmit Pair
Receive Pair
HUB
M9999-022105
Micrel