Delta Data Systems PMAC PCI, Справочник по аппаратуре

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PMAC-PCI Hardware Reference
Jumper Summary 9
Clock Configuration Jumpers
E3-E6: Servo Clock Frequency Control
– The jumpers E3 – E6 determine the servo-clock frequency
by controlling how many times it is divided down from the phase-frequency. The default setting of E3
and E4 OFF, E5 and E6 ON divides the phase-clock frequency by 4, creating a 2.25 kHz servo-clock
frequency. This setting is seldom changed.
E29-E33: Phase Clock Frequency Control
– Only one of the jumpers E29 – E33, which select the
phase-clock frequency, may be on in any configuration. The default setting of E31 ON, which selects a 9
kHz phase-clock frequency, is seldom changed.
E34-E38: Encoder Sample Clock
– Only one of the jumpers E34 – E38, which select the encoder
sample clock frequency, may be on in any configuration. The frequency must be high enough to accept
the maximum true count rate (no more than one count in any clock period), but a lower frequency can
filter out longer noise spikes. The anti-noise digital delay filter can eliminate noise spikes up to one
sample-clock cycle wide.
E40-43: Servo and Phase Clock Direction Control – Jumpers E40-E43 control the software address of
the card, for serial addressing and for sharing the servo and phase clock over the serial connector. Card
@0 sends the clocks and cards @1-@F receive the clocks. If any of these jumpers is removed, PMAC
PCI will expect to receive external servo and phase clock signals on the J4 serial port – if these signals are
not provide in this configuration, the watchdog timer will immediately trip.
E48: Option CPU Clock Frequency Control
– When PMAC is ordered with Option 5B, E48 setup the
CPU clock frequency to either 40 MHz or 60 MHz. If PMAC is ordered with Option 5C additional
software, setup is necessary for 80 MHz CPU clock frequency operation.
E98: DAC/ADC Clock Frequency Control – Leave E98 in its default setting of 1-2, which creates a
2.45 MHz DCLK signal, unless you are connecting an Acc-28 A/D-converter board. In this case, move
the jumper to connect pins 2 and 3, which creates a 1.22 MHz DCLK signal.
Encoder Configuration Jumpers
Encoder Complementary Line Control
– The selection of the type of encoder used, either single ended
or differential is made through the resistor packs configuration and not through a jumper configuration.
E22-E23: Control-Panel Handwheel Enable – Putting these jumpers ON ties the handwheel-encoder
inputs on the JPAN control-panel port to the Channel 2 encoder circuitry. If the handwheel inputs are
connected to Channel 2, no encoder should be connected to Channel 2 through the JMACH1 connector.
E72-E73: Control Panel Analog Input Enable – Putting these jumpers ON ties the output of the Option
10 voltage-to-frequency converter that can process the “WIPER” analog input on the JPAN control panel
port to the Channel 4 encoder circuitry. If the frequency signal is connected to Channel 4, no encoder
should be connected to Channel 4 through the JMACH1 connector.
E74-E75: Encoder Sample Clock Output – Putting these jumpers ON ties the encoder sample-clock
signal to the CHC4 and CHC4/ lines on the JMACH1 port. This permits the clock signal to be used to
synchronize external encoder-processing devices like the Acc-8D Option 8 interpolator board. With these
jumpers ON, no encoder input signal should be connected to these pins.
Board Reset/Save Jumpers
E50: Flash-Save Enable/Disable Control – If E50 is ON (default), the active software configuration of
the PMAC can be stored to non-volatile flash memory with the
SAVE
command. If the jumper on E50 is
removed, this SAVE function is disabled, and the contents of the flash memory cannot be changed.
E51: Re-Initialization on Reset Control – If E51 is OFF (default), PMAC executes a normal reset,
loading active memory from the last saved configuration in non-volatile flash memory. If E51 is ON,
PMAC re-initializes on reset, loading active memory with the factory default values.