MPC8540CVT667JC datasheet(77/104 Pages) FREESCALE

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MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Clocking

15.2 Platform/System PLL Ratio

The platform clock is the clock that drives the L2 cache, the DDR SDRAM data rate, and the e500 core

complex bus (CCB), and is also called the CCB clock. The values are determined by the binary value on

LA[28:31] at power up, as shown in Table 56.

There is no default for this PLL ratio; these signals must be pulled to the desired values.

15.3 e500 Core PLL Ratio

Table 57 describes the clock ratio between the e500 core complex bus (CCB) and the e500 core clock. This

ratio is determined by the binary value of LALE and LGPL2 at power up, as shown in Table 57.

Table 56. CCB Clock Ratio

Binary Value of

LA[28:31] Signals

Ratio Description

0000

16:1 ratio CCB clock: SYSCLK (PCI bus)

0001

Reserved

0010

2:1 ratio CCB clock: SYSCLK (PCI bus)

0011

3:1 ratio CCB clock: SYSCLK (PCI bus)

0100

4:1 ratio CCB clock: SYSCLK (PCI bus)

0101

5:1 ratio CCB clock: SYSCLK (PCI bus)

0110

6:1 ratio CCB clock: SYSCLK (PCI bus)

0111

Reserved

1000

8:1 ratio CCB clock: SYSCLK (PCI bus)

1001

9:1 ratio CCB clock: SYSCLK (PCI bus)

1010

10:1 ratio CCB clock: SYSCLK (PCI bus)

1011

Reserved

1100

12:1 ratio CCB clock: SYSCLK (PCI bus)

1101

Reserved

1110

Reserved

1111

Reserved

Table 57. e500 Core to CCB Ratio

Binary Value of

LALE, LGPL2 Signals

Ratio Description

2:1 e500 core:CCB

5:2 e500 core:CCB

3:1 e500 core:CCB

7:2 e500 core:CCB

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