参数资料
型号: IBM25PPC750FX-DB0513T
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 700 MHz, RISC PROCESSOR, CBGA292
封装: 21 X 21 MM, 1 MM PITCH, CERAMIC, BGA-292
文件页数: 29/62页
文件大小: 452K
代理商: IBM25PPC750FX-DB0513T
DD 2.X
Preliminary
PowerPC 750FX RISC Microprocessor
Body_750FX_DS_DD2.X.fm.2.0
June 9, 2003
5. System Design Information
Page 33 of 63
5.1.3 PLL Conguration
PLL-CFG (Table 5-2) must be set so that both SYSCLK and the core frequency are within the Clock AC
Timing Specifications shown in Table 3-6 on page 13. In addition, the core frequency must not exceed the
limit specified in the part number, and the system must meet the required specifications.
Table 5-2. 750FX Microprocessor PLL Conguration
PLL_CFG [0:4]
Processor to Bus Frequency Ratio (PBFR)
Binary
Decimal
00000
0
OFF
00001
1
OFF
00010
2
PLL Bypass2
00011
3
PLL Bypass2
00100
4
2x1
00101
5
2.5x1
00110
6
3x
00111
7
3.5x
01000
8
4x
01001
9
4.5x
01010
10
5x
01011
11
5.5x
01100
12
6x
01101
13
6.5x
01110
14
7x
01111
15
7.5x
10000
16
8x
10001
17
8.5x
10010
18
9x
10011
19
9.5x
10100
20
10x
10101
21
11x
10110
22
12x
10111
23
13x
11000
24
14x
11001
25
15x
11010
26
16x
Notes:
1. The 2X- 2.5X Processor to Bus Ratios are currently 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.
The AC timing specications given in the document do not apply in PLL-bypass mode.
3. In Clock-off mode, no clocking occurs inside the 750FX regardless of the SYSCLK input.
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