CFA633-RDI-KS datasheet(54/88 Pages) CRYSTAIFONTZ

54 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 54

28 (0x1C): Set ATX Power Switch Functionality

The combination of the CFA633 with the Crystalfontz WR-PWR-Y14 cable can be used to replace the function of the

power and reset switches in a standard ATX-compatible system. The ATX Power Switch Functionality is one of the items

stored by the command 4 (0x04): Store Current State As Boot State (Pg. 39).

The RESET (GPIO[3]) and POWER CONTROL (GPIO[2]) lines on the CFA633 are normally high-impedance.

Electrically, they appear to be disconnected or floating. When the CFA633 asserts the RESET or POWER CONTROL

lines, they are momentarily driven high or low (as determined by the AUTO_POLARITY, RESET_INVERT or

POWER_INVERT bits, detailed below). To end the power or reset pulse, the CFA633 changes the lines back to high-

impedance.

NOTE ON COMMAND 28: SET ATX SWITCH FUNCTIONALITY

The GPIO pins used for ATX control must not be configured as user GPIO. The pins must be con-

figured to their default drive mode in order for the ATX functions to work correctly.

These settings are factory default but may be changed by the user. Please see command 34

(0x22): Set or Set and Configure GPIO Pins (Pg. 58). These settings must be saved as the boot

state.

To ensure that GPIO[1] will operate correctly as ATX SENSE, user GPIO[1] must be configured

as:

DDD = "011: 1=Resistive Pull Up, 0=Fast, Strong Drive Down".

F = "0: Port unused for user GPIO."

This configuration can be assured by sending the following command:

command = 34

length = 3

data[0] = 1

data[1] = 0

data[2] = 3

To ensure that GPIO[2] will operate correctly as ATX POWER, user GPIO[2] must be configured

as:

DDD = "010: Hi-Z, use for input".

F = "0: Port unused for user GPIO."

This configuration can be assured by sending the following command:

command = 34

length = 3

data[0] = 2

data[1] = 0

data[2] = 2

To ensure that GPIO[3] will operate correctly as ATX RESET, user GPIO[3] must be configured as:

DDD = "010: Hi-Z, use for input".

F = "0: Port unused for user GPIO."

This configuration can be assured by sending the following command:

command = 34

length = 3

data[0] = 3

data[1] = 0

data[2] = 2

These settings must be saved as the boot state.

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