xpc7455rx600nc Freescale Semiconductor, Inc, xpc7455rx600nc Datasheet - Page 7

• Manufacturer Part Number: xpc7455rx600nc
• Description: Risc Microprocessor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

1.9.1 PLL Configuration
The MPC7455 PLL is configured by the PLL_CFG[0:4] signals; note that PLL_CFG[4] was formerly called
PLL_EXT in earlier documentation. For a given SYSCLK (bus) frequency, the PLL configuration signals
set the internal CPU and VCO frequency of operation. PLL_CFG[4] will normally be pulled low but can be
asserted for extended modes of operation. The PLL configuration for the MPC7455 is shown in Table 17
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 the settings for Rev. C devices are different than those for subsequent devices.
MOTOROLA
PLL_CFG
00000
01000
01100
10000
10100
10110
10010
11010
01010
00100
00010
11000
11100
01110
01111
[0:4]
Table 17. MPC7455 Microprocessor PLL Configuration Example for 800-MHz Parts
Multiplier
Bus-to-
Core
0.5x
2.5x
3.5x
4.5x
5.5x
6.5x
7.5x
MPC7455 Part Number Specification for the XPC74x5RXnnnNx Series
2x
3x
4x
5x
6x
7x
8x
9x
Multiplier
Core-to-
VCO
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
2x
Freescale Semiconductor, Inc.
For More Information On This Product,
33.3 MHz
Bus
Go to: www.freescale.com
50 MHz
Bus
66.6 MHz
(1000)
(1066)
(1200)
Bus
500
533
600
75 MHz
(1050)
(1200)
(1350)
(1125)
Bus
525
563
600
675
83 MHz
(1080)
(1245)
(1328)
(1494)
(1160)
Bus
540
580
623
664
747
General Parameters
100 MHz
(1000)
(1200)
(1300)
(1400)
(1500)
(1600)
(1100)
Bus
500
550
600
650
700
750
800
133 MHz
(1066)
(1200)
(1333)
(1466)
(1600)
Bus
533
600
667
733
800
7