Copy Paste from Section 8.2 in the Intel � StrongARM * SA-1110 Microprocessor
Developer's Manual
The core clock frequency is configured by software through the core clock
configuration field
(CCF 4:0) in the power manager phase-locked loop (PLL) configuration register (PPCR).
This
field should be programmed during the boot sequence for the desired full-speed
operation.
nRESET clears the field by selecting the lowest frequency operation.
See Section 9.5, "Power Manager" on page 9-26 for the physical address used to access
this
register.
Table 8-1 shows the core clock frequency as a function of the CCF setting.
The actual core clock (DCLK) can switch between being driven by the high speed core
clock
(CCLK, set by CCF 4:0) and the memory clock (MCLK), which runs at half the frequency of
CCLK. CCLK is used except when the SA-1110 is waiting for fills to complete after a
cache miss.
Table 8-1. Core Clock Configurations
CCF 4:0 Core Clock Frequency in MHz
3.6864-MHz Crystal Oscillator 3.5795-MHz Crystal Oscillator
00000 59.0 57.3
00001 73.7 71.6
00010 88.5 85.9
00011 103.2 100.2
00100 118.0 114.5
00101 132.7 128.9
00110 147.5 143.2
00111 162.2 157.5
01000 176.9 171.8
01001 191.7 186.1
01010 206.4 200.5
01011 221.2 214.8
01100- 11111 Not supported. -
The actual core clock (DCLK) can switch between being driven by the high speed core
clock
(CCLK, set by CCF 4:0) and the memory clock (MCLK), which runs at half the frequency of
CCLK. CCLK is used except when the SA-1110 is waiting for fills to complete after a
cache miss.
/Benny
-----Original Message-----
From: Zhao Bingqi-w19411 [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 21, 2001 4:46 PM
To: '[EMAIL PROTECTED]'; 'Russell King - ARM Linux'
Cc: [EMAIL PROTECTED]
Subject: How to Change CPU from 206MHz to 133MHz?
Hello dear all :
I want to change CPU from 206MHz to 133MHz.
How to do?
I must modify some source code ?
And where ?
Thanks
Best Regards.
Tim Zhao.
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