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PC7447 bảng dữ liệu(PDF) 51 Page - ATMEL Corporation

tên linh kiện PC7447
Giải thích chi tiết về linh kiện  PowerPC 7457 RISC Microprocessor
PDF  66 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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PC7447 bảng dữ liệu(HTML) 51 Page - ATMEL Corporation

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51
PC7457/47 [Preliminary]
5345B–HIREL–02/04
System Design
Information
This section provides system and thermal design recommendations for successful appli-
cation of the PC7457.
PLL Configuration
The PC7457 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 PC7457 is shown in Table 18 for a set of exam-
ple frequencies. In this example, shaded cells represent settings that, for a given
SYSCLK frequency, result in core and/or VCO frequencies that don’t comply with the
1 GHz column in Table 8 on page 20.
Table 18. PC7457 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
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)
10101
10x
2x
667
(1333)
750
(1500)
830
(1660)
1000
(2000)
10001
10.5x
2x
700
(1400)
938
(1876)
872
(1744)
1050
(2100)



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