Datasheet

VIPER Embedded Linux Development Kit Quickstart Arcom Embedded Linux (AEL)
The default is to use the performance governor with a maximum frequency of 400MHz.
The powersave and userspace governors are supplied as loadable kernel modules,
called cpufreq_powersave and cpufreq_userspace respectively. They may be loaded
using the modprobe command.
The available performance clock rates are listed in the following table. They correspond
to the modes available when the turbo mode multiplier, CCCR[N] is 1.0.
Clock speed
(KHz)
Core Clock
Configuration
Register
(L, M and N
multipliers)
Memory clock
(MHz)
Run clock
(MHz)
Turbo clock
(MHz)
PX bus (MHz)
99532 27, 1, 1.0 99 99 99 50
132710 36, 1, 1.0 133 133 133 66
199065 27, 2, 1.0 99 199 199 99
265421* 36, 2, 1.0 133 265 265 133
331776* 45, 2, 1.0 166 332 332 166
398131* 27, 4, 1.0 99 398 398 196
* Not available on 200MHz VIPER-LITE.
The available powersave clock rates are listed in the following table:
Clock speed
(KHz)
Core Clock
Configuration
Register
(L, M and N
multipliers)
Memory clock
(MHz)
Run clock
(MHz)
Turbo clock
(MHz)
PX bus (MHz)
99532 27, 1, 1.00 99 99 99 50
199065 27, 1, 2.00 99 99 199 50
298598* 27, 1, 3.00 99 99 299 50
398131* 27, 2, 2.00 99 199 398 99
* Not available on 200MHz VIPER-LITE.
© 2005 Arcom Issue E 23