參數(shù)資料
型號: MPC755
廠商: Motorola, Inc.
英文描述: RISC Microprocessor Hardware Specifications
中文描述: RISC微處理器硬件規(guī)格
文件頁數(shù): 37/56頁
文件大小: 1652K
代理商: MPC755
MPC755 RISC Microprocessor Hardware Specifications, Rev. 6.1
Freescale Semiconductor
37
System Design Information
shaded cells represent settings that, for a given SYSCLK frequency, result in core and/or VCO frequencies that do
not comply with the 400-MHz column in
Table 8
.
Table 16. MPC755 Microprocessor PLL Configuration Example for 400 MHz Parts
PLL_CFG
[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to-
VCO
Multiplier
Bus
33 MHz
Bus
50 MHz
Bus
66 MHz
Bus
75 MHz
Bus
80 MHz
Bus
100 MHz
0100
2x
2x
200
(400)
1000
3x
2x
200
(400)
225
(450)
240
(480)
300
(600)
1110
3.5x
2x
233
(466)
263
(525)
280
(560)
350
(700)
1010
4x
2x
200
(400)
266
(533)
300
(600)
320
(640)
400
(800)
0111
4.5x
2x
225
(450)
300
(600)
338
(675)
360
(720)
1011
5x
2x
250
(500)
333
(666)
375
(750)
400
(800)
1001
5.5x
2x
275
(550)
366
(733)
1101
6x
2x
200
(400)
300
(600)
400
(800)
0101
6.5x
2x
216
(433)
325
(650)
0010
7x
2x
233
(466)
350
(700)
0001
7.5x
2x
250
(500)
375
(750)
1100
8x
2x
266
(533)
400
(800)
0110
10x
2x
333
(666)
0011
PLL off/bypass
PLL off, SYSCLK clocks core circuitry directly, 1x bus-to-core implied
1111
PLL off
PLL off, no core clocking occurs
Notes:
1. PLL_CFG[0:3] settings not listed are reserved.
2. The sample bus-to-core frequencies shown are for reference only. Some PLL configurations may select bus, core, or VCO frequencies which
are not useful, not supported, or not tested for by the MPC755; see
Section 4.2.1, “Clock AC Specifications
,” for valid SYSCLK, core, and
VCO frequencies.
3. 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 and emulator tool use only.
Note:
The AC timing specifications given in this document do not apply in PLL-bypass mode.
4. In PLL off mode, no clocking occurs inside the MPC755 regardless of the SYSCLK input.
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