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KTD-S0043-A Page 13 CPLD Interface

KTA55/pITX Software Guide

6 CPLD Interface

Various functions are implemented in the CPLD: e.g. the watchdog. 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

0x01 RW ---

System control register

Bit 0 Reserved

Bit 1 Reserved

0x02 RO --- Reserved

0x03 RO ---

System status register

Bit 0 Recovery jumper

0 = not active

1 = active

Bit 1 Autostart jumper

0 = active

1 = not active

Bit 2 Reserved

Bit 3 Reserved

Bit 4 Reserved

Bit 5 Last reset caused by watchdog

0 = no

1 = yes

0x04 RO ---

Reserved

0xA2 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

0xA3 RO --- Watchdog timer register

Note: 1) Default Setup settings.

6.1 Reserved Bits

Every bit which is marked as Reserved may not be changed. Not observing this hint can in the worst case

lead to system crashes.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 24 25

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