KSZ8051MNL Datasheet, PDF (30/66 Pages) Micrel Semiconductor – 10Base-T/100Base-TX Physical Layer Transceiver

KSZ8051MNL/RNL
TABLE 3-7: NAND TREE TEST PIN ORDER FOR KSZ8051MNL (CONTINUED)
Pin Number
Pin Name
NAND Tree Description
30
LED0
31
LED1
28
COL
29
CRS
Input
Input
Input
Output
TABLE 3-8: NAND TREE TEST PIN ORDER FOR KSZ8051RNL
Pin Number
Pin Name
NAND Tree Description
11
MDIO
12
MDC
13
PHYAD0
14
PHYAD1
15
RXD1
16
RXD0
18
CRS_DV
19
REF_CLK
20
RXER
21
INTRP
23
TXEN
24
TXD0
25
TXD1
30
LED0
31
LED1
28
CONFIG0
29
CONFIG1
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Output
3.10.1 NAND TREE I/O TESTING
Use the following procedure to check for faults on the KSZ8051MNL/RNL digital I/O pin connections to the board:
1. Enable NAND tree mode using either a hardware strap-in pin (NAND_Tree#, Pin 21) or software (Register 16h,
Bit [5]).
2. Use board logic to drive all KSZ8051MNL/RNL NAND tree input pins high.
3. Use board logic to drive each NAND tree input pin, in KSZ8051MNL/RNL NAND tree pin order, as follows:
a) Toggle the first pin (MDIO) from high to low, and verify that the CRS/CONFIG1 pin switches from high to low
to indicate that the first pin is connected properly.
b) Leave the first pin (MDIO) low.
c) Toggle the second pin (MDC) from high to low, and verify that the CRS/CONFIG1 pin switches from low to
high to indicate that the second pin is connected properly.
d) Leave the first pin (MDIO) and the second pin (MDC) low.
e) Toggle the third pin (RXD3/PHYAD0) from high to low, and verify that the CRS/CONFIG1 pin switches from
high to low to indicate that the third pin is connected properly.
f) Continue with this sequence until all KSZ8051MNL/RNL NAND tree input pins have been toggled.
Each KSZ8051MNL/RNL NAND tree input pin must cause the CRS/CONFIG1 output pin to toggle high-to-low or low-
to-high to indicate a good connection. If the CRS/CONFIG1 pin fails to toggle when the KSZ8051MNL/RNL input pin
toggles from high to low, the input pin has a fault.
DS00002310A-page 30
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