Introduction
VL-586-1 Reference Manual
Overview –
3
P
ARALLEL
P
ORT
The parallel port can be used as a standard bi-directional/ECP/EPP compatible LPT port or as 17
general purpose TTL I/O signals. When operating in standard bi-directional mode, each output
line has a 24 ma current sink rating. Eight of the signals are programmable as a group for input
or output, three are dedicated output, and five are dedicated inputs. A strobe signal, which
produces a 50
µ
s pulse under program control, is also available as an output.
C
OUNTER
/T
IMERS
The VL-586-1 card includes six 8254 type 16-bit counter/timers. Three channels are used by the
operating system; one channel is reserved for dynamic
RAM
refresh, one channel generates an
18.2 ms DOS interrupt, and another channel is used to drive the speaker. The remaining three
channels are unallocated, and can be clocked with on-board crystal oscillators or from external
inputs.
R
EAL
T
IME
C
LOCK WITH
CMOS RAM
A battery-backed 146818 compatible real time clock (RTC) provides accurate date and time
functions. This PC/AT compatible RTC also contains 128 bytes of battery-backed CMOS RAM
with 114 bytes available as a system resource to store standard setup parameters. Normally the
BIOS requires 94 bytes, leaving 20 bytes for general purpose use.
I
NTERRUPT
C
ONTROLLERS
Two PC AT compatible 8259 type programmable interrupt controllers (PICs) are provided for
full DOS functionality. Interrupt sources and destinations can be configured with jumper blocks.
Interrupt lines connect to on-card sources, STD/STD 32, PC/104, and PCI Bus sources, and to a
user connector.
DMA C
ONTROLLERS
The VL-586-1 has two DMA controllers which provide a total of eight DMA channels (four 8-bit
channels and four 16-bit channels.) DMA control signals for seven channels are available on the
PC/104 Bus. The remaining 16-bit channel is accessible only by software. DMA control signals
are not available on the STD Bus, PCI Bus, or via front plane connector.
W
ATCHDOG
T
IMER
A Dallas 1232 watchdog timer circuit provides a degree of protection against hardware and
software failures. When the watchdog timer is enabled, it must be periodically updated by
software at least every 250 ms minimum. A system failure which prevents updating will reset the
CPU. This same circuit monitors the +5V power, and handles a variety of CPU reset functions.
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