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| 型號(hào)： | TSPC603R |
| 英文描述： | TSPC603R [Updated 4/02. 44 Pages] 32-bit RISC Microprocessor. 166-300 MHz |
| 中文描述： | TSPC603R [更新4 / 02。 44頁] 32位RISC微處理器。 166-300兆赫 |
| 文件頁數(shù)： | 39/44頁 |
| 文件大?。?/td> | 636K |
| 代理商： | TSPC603R |
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39
TSPC603R
2125A
–
HIREL
–
04/02
Clock Relationships
Choice
The 603r microprocessors offer customers numerous clocking options. An internal
phase-lock loop synchronizes the processor (CPU) clock to the bus or system clock
(SYSCLK) at various ratios.
Inside each PowerPC microprocessor is a phase-lock loop circuit. A voltage controlled
oscillator (VCO) is precisely controlled in frequency and phase by a frequency/phase
detector which compares the input bus frequency (SYSCLK frequency) to a submultiple
of the VCO.
The ratio of CPU to SYSCLK frequencies is often referred to as the bus mode (for exam-
ple, 2:1 bus mode).
In the Table 17, the horizontal scale represents the bus frequency (SYSCLK) and the
vertical scale represents the PLL-CFG[0-3] signals.
For a given SYSCLK (bus) frequency, the PLL configuration signals set the internal CPU
and VCO frequency of operation.
Notes:
1. Some PLL configurations may select bus, CPU or VCO frequencies which are not supported
2. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly, the PLL is disabled, and the bus mode
is set for 1:1 mode operation. This mode is intended for factory use only.
Note
: the AC timing specifications given in this document do not apply in PLL-bypass mode.
3. In clock-off mode, no clocking occurs inside the 603e regardless of the SYSCLK input.
Table 17.
CPU Frequencies for Common Bus Frequencies and Multipliers
PLL_CFG[0-3]
CPU Frequency in MHZ (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to
VCO
Multiplier
Bus
25 MHz
Bus
33.33 MHz
Bus
40 MHz
Bus
50 MHz
Bus
60 MHz
Bus
66.67 MHz
Bus
75 MHz
0100
2x
2x
-
-
-
-
-
-
150
(300)
0101
2x
4x
-
-
-
-
-
-
-
0110
2.5x
2x
-
-
-
-
150
(300)
166
(333)
187
(375)
1000
3x
2x
-
-
-
150
(300)
180
(360)
200
(400)
225
(450)
1110
3.5x
2x
-
-
-
175
(350)
210
(420)
233
(466)
263
(525)
1010
4x
2x
-
-
160
(320)
200
(400)
240
(480)
267
(533)
300
(600)
0111
4.5x
2x
-
150
(300)
180
(360)
225
(450)
270
(540)
300
(600)
-
1011
5x
2x
-
166
(333)
200
(400)
250
(500)
300
(600)
-
-
1001
5.5x
2x
-
183
(366)
220
(440)
275
(550)
-
-
-
1101
6x
2x
150
(300)
200
(400)
240
(480)
300
(600)
-
-
-
0011
PLL bypass
1111
Clock off
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