參數(shù)資料
型號(hào)： MC7447RX1267LB
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 1267 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, FLIP CHIP, BGA-360
文件頁(yè)數(shù)： 42/87頁(yè)
文件大?。?/td> 1586K
代理商： MC7447RX1267LB
MOTOROLA
MPC7457 RISC Microprocessor Hardware Specifications
47
System Design Information
1.9
System Design Information
This section provides system and thermal design recommendations for successful application of the
MPC7457.
1.9.1
PLL Configuration
The MPC7457 PLL is configured by the PLL_CFG[0:4] signals. For a given SYSCLK (bus) frequency, the
PLL configuration signals set the internal CPU and VCO frequency of operation. The PLL configuration for
the MPC7457 is shown in Table 18 for a set of example frequencies. In this example, shaded cells represent
settings that, for a given SYSCLK frequency, result in core and/or VCO frequencies that do not comply with
the 1-GHz column in Table 8. Note that these configurations were different in devices before Rev F; see
Section 1.11.2, “Part Numbers Not Fully Addressed by This Document,” for more information regarding
documentation of prior revisions.
Table 18. MPC7457 Microprocessor PLL Configuration Example for 1267 MHz Parts
PLL_
CFG[0:4]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to-
VCO
Multiplier
Bus (SYSCLK) Frequency
33.3
MHz
50
MHz
66.6
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
01000
2x
10000
3x
2x
10100
4x
2x
667
(1333)
10110
5x
2x
667
(1333)
835
(1670)
10010
5.5x
2x
733
(1466)
919
(1837)
11010
6x
2x
600
(1200)
800
(1600)
1002
(2004)
01010
6.5x
2x
650
(1300)
866
(1730)
1086
(2171)
00100
7x
2x
700
(1400)
931
(1862)
1169
(2338)
00010
7.5x
2x
623
(1245)
750
(1500)
1000
(2000)
1253
(2505)
11000
8x
2x
600
(1200)
664
(1328)
800
(1600)
1064
(2128)
01100
8.5x
2x
638
(1276)
706
(1412)
850
(1700)
1131
(2261)
01111
9x
2x
600
(1200)
675
(1350)
747
(1494)
900
(1800)
1197
(2394)
01110
9.5x
2x
633
(1266)
712
(1524)
789
(1578)
950
(1900)
1264
(2528)
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