LPC47N267(2000) View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

LPC47N267
(Rev.:2000)

100 Pin LPC Notebook I/O with X-Bus Interface

SMSC -> Microchip 

mode has been exited, observe the output the IO_PME# (pin 17). Toggling any of the input pins should not cause its

state to change.

Setup

Warning: Ensure power supply is off during setup.

1. Connect VSS (pins 7, 31, 60, & 76) to ground.

2. Connect VCC (pins 53, 65 & 93) and VTR (pin 18) to VCC (3.3V).

3. Connect an oscilloscope or voltmeter to IO_PME# (pin 17).

4. All other pins should be tied to ground.

Testing

1. Turn power on.

2. With LAD0 (pin 20) and nLFRAME (pins 24) low, bring PCI_RESET# (pin 26) high. The chip is now in

XNOR chain test mode. At this point, all inputs to the XNOR chain are low. The output on IO_PME# (pin

17) should also be low. Refer to INITIAL CONFIG on Truth Table 1.

3. Bring pin 100 high. The output on IO_PME# (pin 17) should go high. Refer to STEP ONE on Truth Table 1.

4. In descending pin order, bring each input high. The output should switch states each time an input is

toggled. Continue until all inputs are high. The output on IO_PME# (pin 17) should now be low. Refer to

END CONFIG on Truth Table 1.

5. The current state of the chip is now represented by INITIAL CONFIG in Truth Table 2.

6. Each input should now be brought low, starting at pin one and continuing in ascending order. Continue until

all inputs are low. The output on IO_PME# (pin 17) should now be low. Refer to Truth Table 2.

7. To exit test mode, tie LAD0 (pin 20) or LFRAME# (pin 24) high, and toggle PCI_RESET# from a low to a

high state.

INITIAL CONFIG

TRUTH TABLE 1 - Toggling inputs in descending order

PIN 100 PIN 99 PIN 98 PIN 97 PIN 96 PIN ... PIN 1

L

L

L

L

L

L

L

OUTPUT

PIN 17

L

STEP 1

STEP 2

STEP 3

STEP 4

STEP 5

…

STEP N

H

L

L

L

L

L

L

H

H

H

L

L

L

L

L

L

H

H

H

L

L

L

L

H

H

H

H

H

L

L

L

L

H

H

H

H

H

L

L

H

…

…

…

…

…

…

…

…

H

H

H

H

H

H

L

H

END CONFIG

INITIAL CONFIG

H

H

H

H

H

H

H

L

TRUTH TABLE 2 - Toggling inputs in ascending order

PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN ... PIN 100

H

H

H

H

H

H

H

OUTPUT

PIN 17

L

STEP 1

L

H

H

H

H

H

H

H

STEP 2

L

L

H

H

H

H

H

L

STEP 3

L

L

L

H

H

H

H

H

STEP 4

L

L

L

L

H

H

H

L

STEP 5

L

L

L

L

L

H

H

H

…

…

…

…

…

…

…

…

STEP N

L

L

L

L

L

L

H

L

END CONFIG

L

L

L

L

L

L

L

L

SMSC DS – LPC47N267

Page 180

Rev. 10/23/2000

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