參數(shù)資料
型號(hào)： PC7457
廠商： Atmel Corp.
英文描述： PowerPC 7457 RISC Microprocessor
中文描述： 7457的PowerPC RISC微處理器
文件頁(yè)數(shù)： 52/66頁(yè)
文件大?。?/td> 522K
代理商： PC7457
52
PC7457/47 [Preliminary]
5345B–HIREL–02/04
Notes:
1. PLL_CFG[0:4] 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 PC7455; See “Clock AC Specifications” on page 20.
for valid SYSCLK, core, and VCO frequencies.
3. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly and the PLL is disabled. However, the
bus interface unit requires a 2x clock to function. Therefore, an additional signal, EXT_QUAL, must be driven at one-half the
frequency of SYSCLK and offset in phase to meet the required input setup t
IVKH
and hold time t
IXKH
(see Table 9 on page
22). The result is that the processor bus frequency is one-half SYSCLK while the internal processor is clocked at SYSCLK
frequency. 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.
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
10011
11x
2x
733
(1466)
825
(1650)
913
(1826)
1100
(2200)
00000
11.5x
2x
766
(532)
863
(1726)
955
(1910)
1150
(2300)
10111
12x
2x
600
(1200)
800
(1600)
900
(1800)
996
(1992)
1200
(2400)
11111
12.5x
2x
600
(1200)
833
(1666)
938
(1876)
1038
(2076)
1250
(2500)
01011
13x
2x
650
(1300)
865
(1730)
975
(1950)
1079
(2158)
11100
13.5x
2x
675
(1350)
900
(1800)
1013
(2026)
1121
(2242)
11001
14x
2x
700
(1400)
933
(1866)
1050
(2100)
1162
(2324)
00011
15x
2x
750
(1500)
1000
(2000)
1125
(2250)
1245
(2490)
11011
16x
2x
800
(1600)
1066
(2132)
1200
(2400)
00001
17x
2x
850
(1900)
1132
(2264)
00101
18x
2x
600
(1200)
900
(1800)
1200
(2400)
00111
20x
2x
667
(1334)
1000
(2000)
01001
21x
2x
700
(1400)
1050
(2100)
01101
24x
2x
800
(1600)
1200
(2400)
11101
28x
2x
933
(1866)
00110
PLL bypass
PLL off, SYSCLK clocks core circuitry directly
11110
PLL off
PLL off, no core clocking occurs
Table 18.
PC7457 Microprocessor PLL Configuration Example for 1267 MHz Parts (Continued)
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