A. Board Configuration
ÛZIATECH
96
CT #
State
Function
CT4
In
Clock channel 2 driven with on-board 8 MHz clock
Out
Clock source driven from J2, pin 8
CT5
†
In
Clock channel 1 driven with on-board 8 MHz clock
Out
Clock source driven from J2, pin 4
CT6
†
In
Clock channel 0 driven with on-board 8 MHz clock
Out
Clock source driven from J2, pin 1
CT7, CT8 (IRQ15 Input Source Selection)
Configuration of these cuttable traces routes the sources described below to the
interrupt controller IRQ15 input.
Auxiliary counter/timer:
When CT7A and CT8A are installed (default), the output of
auxiliary counter/timer channel 2 is routed to IRQ15. When the counter output on
counter/timer channel 2 is active, an interrupt will be sent to the interrupt controller input
IRQ15.
Digital I/O Event Sense:
When CT7B and CT8A are installed and the Digital I/O ASIC
chip is programmed to interrupt on an external event, an interrupt is sent to the interrupt
controller input IRQ15. See the "
" topic in Chapter 10 for
more information about the 16C50A Digital I/O ASIC's event sense feature.
Connector J1 pin 8:
When CT8B is installed, frontplane interrupt J1 pin 8 (FP6) is
routed to the interrupt controller input IRQ15. A typical use for this is connection of a
secondary IDE controller (ZT 8944).
CT7 CT8 Source Routed to Interrupt Controller IRQ15 Input
†
A
A
Auxiliary counter/timer channel 2
B
A
16C50A Digital I/O ASIC Event Sense interrupt
---
B
Connector J1, pin 8
†
Factory default configuration
