參數(shù)資料
型號： MPC7450RX667LX
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 667 MHz, RISC PROCESSOR, CBGA483
封裝： 29 X 29 MM, 3.22 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-483
文件頁數(shù)： 41/60頁
文件大?。?/td> 1296K
代理商： MPC7450RX667LX
46
MPC7450 RISC Microprocessor Hardware Specifications
System Design Information
1.9 System Design Information
This section provides system and thermal design recommendations for successful application of the
MPC7450.
1.9.1 PLL Configuration
The MPC7450 PLL is configured by the PLL_EXT and PLL_CFG[0:3] signals. For a given SYSCLK (bus)
frequency, the PLL configuration signals set the internal CPU and VCO frequency of operation. PLL_EXT
will normally be pulled low but can be asserted for extended modes of operation. The PLL configuration
for the MPC7450 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 667-MHz column in Table 9.
Table 18. MPC7450 Microprocessor PLL Configuration Example
PLL_EXT
PLL_CFG
[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to-
VCO
Multiplier
Bus
33.3 MHz
Bus
50 MHz
Bus
66.6 MHz
Bus
75 MHz
Bus
83 MHz
Bus
100 MHz
Bus
133 MHz
00000
0.5x
2x
16
(33)
25
(50)
33
(66)
37
(75)
47
(83)
50
(100)
66
(133)
00100
2x
66
(133)
100
(200)
133
(266)
150
(300)
166
(333)
200
(400)
266 (533)
00110
2.5x
2x
83
(166)
125
(250)
166
(333)
187
(375)
208
(415)
250
(500)
333
(666)
01000
3x
2x
100
(200)
150
(300)
200 (400)
225
(450)
250
(500)
300
(600)
400
(800)
0
1110
3.5x
2x
116
(233)
175
(350)
233 (466)
262
(525)
291
(581)
350
(700)
466
(933)
01010
4x
2x
133
(266)
200
(400)
266 (533)
300
(600)
333
(666)
400
(800)
533
(1066)
0
0111
4.5x
2x
150
(300)
225
(450)
300
(600)
337
(675)
374
(747)
450
(900)
600
(1200)
0
1011
5x
2x
166
(333)
250
(500)
333
(666)
375
(750)
415
(830)
500
(1000)
667
(1333)
01001
5.5x
2x
183 (366)
275
(550)
366
(733)
412
(825)
457
(913)
550
(1100)
733
(1466)
0
1101
6x
2x
200 (400)
300
(600)
400
(800)
450
(900)
498
(996)
600
(1200)
00101
6.5x
2x
216 (433)
325
(630)
433
(866)
488
(975)
540
(1080)
650
(1300)
00010
7x
2x
233 (466)
350
(700)
466
(933)
525
(1050)
581
(1162)
700
(1400)
00001
7.5x
2x
250
(500)
375
(750)
500
(1000)
563
(1125)
623
(1245)
750
(1500)
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