PMAC-Lite Hardware Reference
E-Point Descriptions
17
E48: CPU Clock Frequency Control
E Point &
Physical Layout
Location Description
Default
E48
C1
Jump pins 1 and 2 to multiply crystal
frequency by 3 inside CPU for 60 MHz
operation
Remove jumper to multiply crystal
frequency by 2 inside CPU for 40 MHz
operation
Don’t care for 20 MHz CPU versions
For 80 MHz operation, set jumper for
40 MHz, then increase speed in
software (WX$FFFD,$750003)
No jumper
installed (20, 40 &
80 MHz versions)
Jumper installed
(60 MHz version)
Note:
It may be possible to operate a board at a frequency higher than that for which its components are
are rated. However, this uses the components outside of their specified operating range, and proper
execution of the PMAC under these conditions is not guaranteed. PMAC software failure is possible,
even probable, under these conditions, and this can lead to very dangerous machine failure. Operation in
this mode is done completely at the user’s own risk; Delta Tau can accept no responsibility for the
operation of the PMAC or the machine under these conditions.
E49: Serial Communications Parity Control
E Point &
Physical Layout
Location Description
Default
E49
C1
Jump pin 1 to 2 for NO serial parity;
remove jumper for ODD serial parity
Jumper installed
E50: Non-Volatile Memory Save Control
E Point &
Physical Layout
Location Description
Default
E50
C1
Jump pin 1 to 2 to enable save to
EAROM or flash memory
Remove jumper to disable save to
EAROM or flash memory
Jumper installed
E51: Normal/Re-initializing Power-Up
E Point &
Physical Layout
Location Description
Default
E51
C1
Jump pin 1 to 2 to re-initialize on
power-up/reset, loading factory default
parameters
Remove jumper for normal power-
up/reset, loading last saved parameters
No jumper
installed
Note:
On the Universal PMAC-Lite, the board is put in “bootstrap mode” for the loading of new firmware
by connecting pins 2 and 3 of E106. E51 is for re-initialization of parameters only.
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