KS8721BL/SL Demo Board User Guide Rev. 1.0
Hardware Description
J2
RJ45
T1
U2
Jumper BanK1
Jumper Bank2
LED0-3
J13,J14,J15,J16,J12,J10
J3,J4,J5,J6,J7,J8,J9,J11
KS8721BL/SL
MII Connector
Transformer
Fig-1 KS8721BL/SL Demo Board Layout
LED indicators
There are 4 LED to indicate the traffic activities.
LED0 – “ON” is Link, “Toggle” is Activity
LED1 – “ON” is 100 Base, “OFF” is 10 Base
LED2 – “ON” is Full Duplex, “OFF” is Half Duplex
LED3 – “ON” is Collision, “OFF” is no Collision
Jumper setting
KS8721BL/SL will read the following settings during power up or RESET stage.
J3, J4, J5, J6 and J10 -- setup the PHY address at power up, the default is 00001
when J3 to J6 and J10 are open.
J7, “SHORT” Enable PCS Loop back, default is “OPEN”.
J11, “SHORT” Enable ISOLATE MII mode, all MII pins are high impedance, default is
“OPEN”.
J12 – Open for normal operation, short for POWER DOWN mode, default is “OPEN”.
J13 (LED0) – Factory test pin.
J14 (LED1) – Open for 100 Base, short for 10 Base, default is “OPEN”.
J15 (LED2) – Open Full Duplex, short Half Duplex, default is “OPEN”.
J16* (LED3) – Open Auto negotiation, short for force mode, default is “OPEN”.
* Even at Auto-negotiation mode (J16), the max advertised capability is set by J14. J15.
Micrel Confidential Information @2003
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