ADLINK ACL-8216 - Manual (Page 22)

14 • Installation
2.9 Clock Source Setting
The 8254 programmable interval timer is used in the ACL-8216. It provides 3
independent channels of 16-bit programmable down counters. The input of
counter 2 is connected to a precision 2MHz oscillator for internal pacer. The
input of counter 1 is cascaded from the output of counter 2. The channel 0 is
free for user's applications. There are two selections for the clock source of
channel 0: the internal 2MHz clock or the external clock signal from
connector CN3 pin 37. The setting of clock is shown as Figure 2.6.
2.10 IRQ Level Setting
The ACL-8216 can connect to any one of the interrupt lines of the PC I/O
channel. The interrupt line is selected by the jumper JP7. If you wish to use
the interrupt capability of ACL-8216, you must select an interrupt level and
place the jumper in the appropriate position to enable the particular interrupt
line.
The default interrupt level is IRQ15, which is selected by placing the jumper
on the pins in row number 15. Figure 2.7 shows the default interrupt jumper
setting IRQ15. You only remove the jumper from IRQ15 to other new pins, if
you want to change to another IRQ level.
Note: Be aware that there is no other add-on card shares the same
interrupt level at the same system.
3 5 6 7 9 10 11 15 NC 12
3 5 6 7 9 10 11 15 NC 12
No Interrupt :
Interrupt level :
IRQ15
(default setting)
JP7
JP7
Figure 2.7 IRQ Level Setting