Kontron KTLX800-pITX - Manual (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
Register overview:
Index Type Reset Function
0x00 RO --- CPLD version register
0x02 RW 0x7C 1)
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 1)
Reserved register
Bit 0 - 7 Reserved
0x05 RW 0x80
1)
Backlight register
Bit 0 - 7 Brightness value
0x06 RW 0x08
1)
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 1)
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