PMAC PCI-Lite Hardware Reference Manual
6
Hardware Setup
E17A - E17D: Motors 1-4 Amplifier-Enable Polarity Control
– Jumpers E17A through E17D control
the polarity of the amplifier enable signal for the corresponding motor 1 to 4. When the jumper is OFF
(default), the amplifier-enable line for the corresponding motor is low true so the enable state is low-
voltage output and sinking current, and the disable state is not conducting current. If the default
ULN2803A sinking driver used by the PMAC is on U37, this is the fail-safe option. This allows the
circuit to fail in the disable state. With this jumper ON, the amplifier-enable line is high true so the
enable state is not conducting current, and the disable state is low-voltage output and sinking current.
(This setting is not generally recommended.)
E28: Following-Error/Watchdog-Timer Signal Control
– With this jumper connecting pins 2 and 3
(default), the FEFCO/ output on pin 57 of the J8 JMACH servo connector outputs the watchdog timer
signal. With this jumper connecting pins 1 and 2, this pin outputs the warning following error status line
for the selected coordinate system.
E101-E102: Motors 1-4 AENA/EQU Voltage Configure
– The U37 driver IC controls the AENA and
EQU signals of motors 1-4. With the default sinking output driver IC (ULN2803A or equivalent) in U37,
these jumpers must connect pins 1 and 2 to supply the IC correctly. If this IC is replaced with a sourcing
output driver IC (UDN2981A or equivalent), these jumpers must be changed to connect pins 2 and 3 to
supply the new IC correctly.
Caution:
A wrong setting of these jumpers will damage the associated output IC.
E122: XIN7 Feature Selection
– Jump 2-3 to bring the Power Good signal into register XIN7 at
Y:$E801 bit 7.
Reserved Configuration Jumpers
E0:
Reserved for future use.
E109:
Reserved for future use.
CPU Jumper Configuration
E10A-E10C: Flash Memory Bank Select Jumpers
– The flash-memory IC in location U146 on the
PMAC PCI Lite 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 E10A, E10B, and E10C 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.
E18-E20: Power-Up State Jumpers
– Jumper E18 must be OFF, jumpers E19 and E20 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.)
E21: Firmware Load Jumper
– If jumper E21 is ON during power-up/reset, the board comes up in
bootstrap mode, which permits the loading of new firmware into the flash-memory IC on the board.
When the PMAC Executive program tries to establish communications with a board in this mode, it will
automatically detect that the board is in bootstrap mode and ask what file to download as the new
firmware. Jumper E21 must be OFF during power-up/reset for the board to come up in normal
operational mode.
E119: Watchdog Timer Jumper
- Jumper E119 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. E1 should
only be put ON to debug problems with the watchdog timer circuit.
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