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參數(shù)資料
| 型號： | IBM25PPC740L-GB400A2T |
| 英文描述： | MICROPROCESSOR|32-BIT|CMOS|BGA|255PIN|CERAMIC |
| 中文描述： | 微處理器| 32位|的CMOS | BGA封裝| 255PIN |陶瓷 |
| 文件頁數(shù)： | 39/50頁 |
| 文件大?。?/td> | 516K |
| 代理商： | IBM25PPC740L-GB400A2T |
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5/20/99
Version 1.51
PowerPC 740 and PowerPC 750 Datasheet
Page 35
PowerPC 740 and PowerPC 750 Embedded Microprocessor
IBM CMOS 0.20 um Copper Technology EMPPC740L and EMPPC750L
System Design Information
This section provides electrical and thermal design recommendations for successful application of the 750.
PLL Configuration
The 750 PLL is configured by the PLL_CFG[0-3-] signals. For a given SYSCLK (bus) frequency, the PLL con-
figuration signals set the internal CPU and VCO frequency of operation.
750 Microprocessor PLL Configuration
PLL_CFG
(0:3)
Processor to Bus Frequency Ratio
VCO Divider
5
bin
dec
0000
0
Rsv
1
n/a
0001
1
7.5x
2
0010
2
7x
2
0011
3
PLL Bypass
3
n/a
0100
4
2x
7
2
0101
5
6.5x
2
0110
6
2.5x
6,7
2
0111
7
4.5x
2
1000
8
3x
2
1001
9
5.5x
2
1010
10
4x
2
1011
11
5x
2
1100
12
8x
2
1101
13
6x
2
1110
14
3.5x
2
1111
15
Off
4
n/a
Note:
1. Reserved settings.
2. SYSCLK min is limited by the lowest frequency that manufacturing will support, see Section , “Clock AC Specifications,” for valid SYSCLK 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 only.
Note:
The AC timing specifications given in the document do not apply in PLL-bypass mode.
4. In Clock - off mode, no clocking occurs inside the 750 regardless of the SYSCLK input.
5. The VCO to core clock ratio is 2x for 740/750. This simplifies clock frequency calculations so the user can disregard the VCO frequency. The VCO will
operate correctly when the core clock is within specification.
6. 0110 will change from 2.5x in dd2.x to 10x in dd3.x.
7. These values are for dd2.x only. In dd3.x, these PLL.CFG settings may change.
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