User's Manual

PMAC VME Hardware Reference Manual
PMAC VME E-Point Descriptions 7
E44 - E47: Communications Control
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.
Baud Rate Control E-Points Baud Rate
Default and
Physical Layout
E44 E45 E46 E47
Option 4A Standard,
Option 5A
Option 5,
Option 5B
ON ON ON ON Disabled Disabled Disabled
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
E44
E45
E46
E47
Location: All D3 Picture
is for a PMAC with a
Standard or Option 5A
CPU
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., Opt. 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
These jumpers are used only to set the baud rate at power-on/reset.
* Non-standard baud rates
E48: RAM Wait State Control (Standard CPU Section)
E48 controls the memory wait states only on PMACs with a standard CPU section using battery backup.
This CPU section is used on PMACs ordered with no CPU or memory options and Option 5 (not Opt 4A,
5A, or 5B).
E Point and
Physical Layout
Location Description Default
E48
C2 Jump pin 1 to 2 for zero wait state
operation; remove jumper for one wait
state operation.
No jumper installed
(standard configuration)
Jumper installed (Option 5)