MPC8548ECPXATHC datasheet(132/151 Pages) FREESCALE

132 / 151 page

MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

132

Freescale Semiconductor

Clocking

20.2

CCB/SYSCLK PLL Ratio

The CCB clock is the clock that drives the e500 core complex bus (CCB), and is also called the platform

clock. The frequency of the CCB is set using the following reset signals, as shown in Table 81:

•

SYSCLK input signal

•

Binary value on LA[28:31] at power up

Note that there is no default for this PLL ratio; these signals must be pulled to the desired values. Also note

that the DDR data rate is the determining factor in selecting the CCB bus frequency, since the CCB

frequency must equal the DDR data rate.

For specifications on the PCI_CLK, see the PCI 2.2 Specification.

Table 80. Memory Bus Clocking Specifications (MPC8543E)

Characteristic

Maximum Processor Core Frequency

Unit

Notes

800, 1000 MHz

Min

Max

Memory bus clock speed

166

200

MHz

1, 2

Notes:

1. Caution: The CCB clock to SYSCLK ratio and e500 core to CCB clock ratio settings must be chosen such that the resulting

SYSCLK frequency, e500 (core) frequency, and CCB clock frequency do not exceed their respective maximum or minimum

operating frequencies. See Section 20.2, “CCB/SYSCLK PLL Ratio,” and Section 20.3, “e500 Core PLL Ratio,” for ratio

settings.

2. The memory bus speed is half of the DDR/DDR2 data rate, hence, half of the platform clock frequency.

Table 81. CCB Clock Ratio

Binary Value of LA[28:31] Signals

CCB:SYSCLK Ratio

Binary Value of LA[28:31] Signals

CCB:SYSCLK Ratio

0000

16:1

1000

8:1

0001

Reserved

1001

9:1

0010

2:1

1010

10:1

0011

3:1

1011

Reserved

0100

4:1

1100

12:1

0101

5:1

1101

20:1

0110

6:1

1110

Reserved

0111

Reserved

1111

Reserved

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