PMAC-PCI Hardware Reference
PMAC-PCI
E-Point Jumper Descriptions
19
E44 - E47: Serial Port Baud Rate
Jumpers E44 - E47 control what baud rate to use for serial communications. Any character received over
the bus causes PMAC to use the bus for its standard communications. The serial port is disabled if E44-
E47 are all on. The baud rate setting of an 80 MHz CPU section ordered with Opt 5C is performed by
software; refer to the dedicated section on the Software Configuration chapter of this manual.
Baud Rate Control E Points
Baud Rate
Default and
Physical Layout
E44
E45
E46
E47
Option
4A
Standard,
Option
5A
Option 5,
Option
5B
E44 E45 E46 E47
Loc. B5 B5 C5 C5
ON
ON
ON
ON
Disabled
Disabled
Disabled
Picture is for a PMAC
with a Standard or
Option 5A CPU
OFF
ON
ON
ON
300
600
900
ON
OFF
ON
ON
400*
800*
1200
OFF
OFF
ON
ON
600
1200
1800
ON
ON
OFF
ON
800*
1600*
2400
OFF
ON
OFF
ON
1200
2400
3600
ON
OFF
OFF
ON
1600*
3200*
4800
OFF
OFF
OFF
ON
2400
4800
7200
ON
ON
ON
OFF
3200*
6400*
9600
Options 5, 5B
OFF
ON
ON
OFF
4800
9600
14400
Std., Option 5A
ON
OFF
ON
OFF
6400*
12800*
19200
OFF
OFF
ON
OFF
9600
19200
28800
Option 4A
ON
ON
OFF
OFF
12800*
25600*
38400
OFF
ON
OFF
OFF
19200
38400
57600
ON
OFF
OFF
OFF
25600*
51200*
76800
OFF
OFF
OFF
OFF
38400
76800
115200
Note:
These jumpers are only used to set the baud rate at power-on/reset. Currently, Flex CPU’s
communication baud rate is determined at power-up/reset by variable I54.
* Non-standard baud rates.
E48: CPU Clock Frequency Control (Option CPU Section)
E48 controls the CPU clock frequency only on PMAC with an option CPU section using flash memory
backup (no battery). This CPU section is used on PMACs ordered with Opt 4A, 5A, or 5B. The 80 MHz
setting of a CPU section ordered with Opt 5C is performed by software; refer to the dedicated section on
the Software Configuration chapter of this manual.
E Point and
Physical Layout
Location
Description
Default
E48
C5
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.
Jumper installed
(Option 5, 5B)
Jumper not
installed (Standard,
Option 4A, 5A)
Note:
It may be possible to operate a board with 40 MHz components (Option 5A) at 60 MHz under
some conditions by changing the setting of jumper E48. However, this operates the components outside
of their specified operating range, and proper execution of 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 PMAC or the machine under these conditions.
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