mpc7450 Freescale Semiconductor, Inc, mpc7450 Datasheet - Page 36

• Manufacturer Part Number: mpc7450
• Description: Mpc7450 Risc Microprocessor
• Manufacturer: Freescale Semiconductor, Inc

System Design Information
1.9
This section provides system and thermal design recommendations for successful application of the
MPC7450.
1.9.1
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 16 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 600-MHz column in Table 8.
36
PLL_EXT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 16. MPC7450 Microprocessor PLL Configuration Example for 600 MHz Parts
System Design Information
PLL_CFG
PLL Configuration
0000
0100
0110
1000
1110
1010
0111
1011
1001
1101
0101
0010
0001
1100
[0:3]
Multiplier
Bus-to-
MPC7450 RISC Microprocessor Hardware Specifications
Core
0.5x
2.5x
3.5x
4.5x
5.5x
6.5x
7.5x
2x
3x
4x
5x
6x
7x
8x
Freescale Semiconductor, Inc.
For More Information On This Product,
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Multiplier
Core-to-
VCO
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
Go to: www.freescale.com
33.3 MHz
(133)
(166)
(200)
(233)
(266)
(300)
(333)
(366)
(400)
(433)
(466)
(500)
(533)
Bus
(33)
100
116
133
150
166
183
200
216
233
250
266
16
66
83
50 MHz
(200)
(250)
(300)
(350)
(400)
(450)
(500)
(550)
(600)
(630)
(700)
(750)
(800)
Bus
(50)
100
125
150
175
200
225
250
275
300
325
350
375
400
25
66.6 MHz
(1000)
(1066)
(266)
(333)
(400)
(466)
(533)
(600)
(666)
(733)
(800)
(866)
(933)
Bus
(66)
133
166
200
233
266
300
333
366
400
433
466
500
533
33
75 MHz
(1050)
(1125)
(1200)
(300)
(375)
(450)
(525)
(600)
(675)
(750)
(825)
(900)
(975)
Bus
(75)
150
187
225
262
300
337
375
412
450
488
525
563
600
37
83 MHz
(1080)
(1162)
(1245)
(1328)
(333)
(415)
(500)
(581)
(666)
(747)
(830)
(913)
(996)
Bus
(83)
166
208
250
291
333
374
415
457
498
540
581
623
664
47
100 MHz
(1000)
(1100)
(1200)
(1300)
(1400)
(1500)
(100)
(400)
(500)
(600)
(700)
(800)
(900)
Bus
200
250
300
350
400
450
500
550
600
650
700
750
50
MOTOROLA
133 MHz
(1066)
(1200)
(1333)
(1466)
(133)
(533)
(666)
(800)
(933)
Bus
266
333
400
466
533
600
667
733
66