Kontron KTLX800-pITX User Manual download pdf (Page 15)

KTD-S0023-A Page 12 CPLD Interface

KTLX800/pITX Software Guide

5 CPLD Interface

Various functions are implemented in two CPLDs: e.g. watchdog, digital I/O and fan control. Access to the

CPLD register is via an index-data register pair using only two I/O byte locations (fixed addresses).

Index Register Data Register

0xA80 0xA81

Index Type Reset Function

0x00 RO --- CPLD version register

0x02 RW

0x7C

System control register

Bit 0 + 7 Reserved

Bit 1 Autostart function

0 = do nothing

1 = restart

Bit 2 Enable/disable LAN controller

0 = disabled

1 = enabled

Bit 3 Enable/disable COM1/2 interf.

0 = disabled

1 = enabled

Bit 4 Enable/disable GPIO CPLD

0 = disabled

1 = enabled

Bit 5 Enable/disable onboard flash

0 = disabled

1 = enabled

Bit 6 Enable/disable SDIO/4th USB

0 = disabled

1 = enabled

0x03 RO ---

System status register

Bit 0 Crisis jumper

0 = active

1 = not active

Bit 1 Autostart jumper

0 = active

1 = not active

Bit 2 Backlight polarity jumper

0 = inverted

1 = not inverted

Bit 3 - 7 Reserved

0x04 RW

0xCF

Reserved register

Bit 0 - 7 Reserved

0x05 RW

0x80

Backlight register

Bit 0 - 7 Brightness value

0x06 RW

0x08

Fan speed control register

Bit 0 - 3 Fan output value

Bit 4 - 7 Rotation speed divider

0x07 RO ---

Fan rotation speed register

Bit 0 - 7 Fan rotation speed value

0x08 RW

0x00

Watchdog control register

Bit 0 - 1 Watchdog time value

Bit 2 - 3 Reserved

Bit 4 Watchdog time base

0 = seconds

1 = minutes

Bit 5 Reserved

Bit 6 Watchdog control

0 = disabled

1 = enabled

Bit 7 Trigger control

0 = disabled

1 = enabled

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 36 37

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Kontron KTLX800-pITX User Manual Page 15

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