PMAC2A-PC/104
Base Board Hardware Setup
6
CPU Jumper Configuration
E15A-E15C: Flash Memory Bank Select Jumpers
– The flash-memory IC in location U10 on the
PMAC2A-PC/104 base board has the capacity for eight separate banks of firmware, only one of which
can be used at any given time. The eight combinations of settings for jumpers E15A, E15B, and E15C
select which bank of the flash memory is used. In the factory production process, firmware is loaded only
into Bank 0, which is selected by having all of these jumpers OFF.
E10-E12: Power-Up State Jumpers
– Jumper E10 must be OFF, jumper E11 must be ON, and jumper
E12 must be ON, in order for the CPU to copy the firmware from flash memory into active RAM on
power-up/reset. This is necessary for normal operation of the card. (Other settings are for factory use
only.)
E14: Watchdog Timer Jumper
– Jumper E14 must be OFF for the watchdog timer to operate. This is a
very important safety feature, so it is vital that this jumper be OFF in normal operation. E14 should only
be put ON to debug problems with the watchdog timer circuit.
W1: Flash chip select
– Jumper W1 in position 1-2 selects a 28F320J3A part for the U10 flash chip.
Jumper W1 in position 2-3 selects a 28F320J5A part for the U10 flash chip. This jumper is installed in
factory and must not be changed from its default state.
Communication Jumpers
E18-E19: PC/104 Bus Base Address Control
– Jumpers E18 and E19 on the PMAC2A-PC/104 base
board determine the base address of the card in the I/O space of the host PC's bus. Together, they specify
4 consecutive addresses on the bus where the card can be found. The jumpers form the base address in
the following fashion:
E18 E19
Address
(hex)
Address
(dec)
OFF OFF
$200
512
OFF ON
$210
528
ON OFF
$220
544
ON ON
$230
560
The default base address is 528 ($210) formed with jumper E18 removed and E19 installed. This
configuration is necessary for using the USB or Ethernet ports of the ACC-2P communications board.
I/O Configuration Jumpers
E16: ADC Enable Jumper
– Install E16 to enable the analog-to-digital converter circuitry ordered
through Option-12. Remove this jumper to disable this option, which might be necessary to control
motor 1 through a digital amplifier with current feedback.
Resistor Packs Configuration
Differential or Single-Ended Encoder Selection
The differential input signal pairs to the PMAC have user-configurable pull-up/pull-down resistor
networks to permit the acceptance of either single-ended or differential signals in one setting, or the
detection of lost differential signals in another setting.
The ‘+’ inputs of each differential pair each have a hard-wired 1 k
Ω
pull-up resistor to +5V. This cannot
be changed.
Summary of Contents for PMAC2A-PC/104
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Page 14: ...PMAC2A PC 104 Base Board Hardware Setup 8 ...
Page 34: ...PMAC2A PC 104 PMAC2A PC 104 Software Setup 28 ...
Page 41: ...PMAC2A PC 104 ACC 1P Hardware Reference Summary 35 ...
Page 51: ...PMAC2A PC 104 Base Board E Point Jumper Descriptions 45 ...
Page 55: ...PMAC2A PC 104 Acc 1P E Point Jumper Descriptions 49 ...