Reference Manual

PMAC-PCI Hardware Reference
Software Setup 57
• If the saved value of I46 is 0, so the CPU’s operational frequency is determined by jumper
settings, then the serial baud rate is determined by a combination of the setting of jumpers E44-
E47 and the CPU frequency on a PMAC(1) board, as shown in the following table. These
settings maintain backward compatibility.
E44 E45 E46 E47
Baud Rate
for 20MHz
Baud Rate
for 40MHz
Baud Rate
for 60MHz
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
ON OFF OFF ON 1600* 3200* 4800
OFF OFF OFF ON 2400 4800 7200
ON ON ON OFF 3200* 6400* 9600
OFF ON ON OFF 4800 9600 14400
ON OFF ON OFF 6400* 12800* 19200
OFF OFF ON OFF 9600 19200 28800
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
* Not an exact baud rate