參數(shù)資料
型號： PC755CMGU400LE
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： PowerPC 755/745 RISC Microprocessor
中文描述： 32-BIT, 400 MHz, RISC PROCESSOR, CBGA360
封裝： CERAMIC, BGA-360
文件頁數(shù)： 43/50頁
文件大?。?/td> 1064K
代理商： PC755CMGU400LE
43
PC755/745
2138D–HIREL–06/03
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 PC755; see Section Clock AC Specifications
page 25 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 PC755 regardless of the SYSCLK input.
Table 18.
PC755 Microprocessor PLL Configuration
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
5733
°
-
-
-
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
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