Micrel, Inc.
KSZ9021RL/RN
NAND Tree Support
The KSZ9021RL/RN provides parametric NAND tree support for fault detection between chip I/Os and board. NAND tree
mode is enabled at power-up / reset with the MODE[3:0] strap-in pins set to 0100.
The following tables list the NAND tree pin order for KSZ9021RL and KSZ9021RN.
Pin
Description
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Output
LED2
LED1
TXD0
TXD1
TXD2
TXD3
TX_ER
GTX_CLK
TX_EN
RX_DV
RX_ER
RX_CLK
CRS
COL
INT_N
MDC
MDIO
CLK125_NDO
Table 8. NAND Tree Test Pin Order – for KSZ9021RL
Pin
Description
Input
LED2
LED1
Input
TXD0
Input
TXD1
Input
TXD2
Input
TXD3
Input
GTX_CLK
TX_EN
RX_DV
RX_CLK
INT_N
MDC
Input
Input
Input
Input
Input
Input
MDIO
Input
CLK125_NDO
Output
Table 9. NAND Tree Test Pin Order – for KSZ9021RN
M9999-101309-1.1
October 2009
32
MICREL [ MICREL SEMICONDUCTOR ]
