MPC8309CVMADFC datasheet(71/81 Pages) NXP

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3

Freescale Semiconductor

Clocking

NOTE

The VCO divider (RCWL[CEVCOD]) must be set properly so that the

QUICC Engine VCO frequency is in the range of 300–600 MHz. The

QUICC Engine frequency is not restricted by the CSB and core frequencies.

The CSB, core, and QUICC Engine frequencies should be selected

according to the performance requirements.

The QUICC Engine VCO frequency is derived from the following

equations:

qe_clk = (primary clock input × CEPMF)

 (1 + CEPDF)

QUICC Engine VCO Frequency = qe_clk × VCO divider × (1 + CEPDF)

23.7

Suggested PLL Configurations

To simplify the PLL configurations, the MPC8309 might be separated into two clock domains. The first

domain contains the CSB PLL and the core PLL. The core PLL is connected serially to the CSB PLL, and

has the csb_clk as its input clock. The second clock domain has the QUICC Engine PLL. The clock

domains are independent, and each of their PLLs is configured separately.

The following table shows suggested PLL configurations for 33 and 66 MHz input clocks.

Table 63. Suggested PLL Configurations

Conf No.

SPMF

Core

PLL

CEPMF

CEDF

Input Clock

Frequency

(MHz)

CSB

Frequency

(MHz)

Core

Frequency

(MHz)

QUICC

Engine

Frequency

(MHz)

0100

0000100

0111

33.33

133.33

266.66

233

0010

0000100

0111

66.67

133.33

266.66

233

0100

0000101

0111

33.33

133.33

333.33

233

0101

0000101

1001

125

312.5

225

0010

0000101

0111

66.67

133.33

333.33

233

0100

0000110

0111

33.33

133.33

399.96

233

0101

0000110

1000

125

375

225

0010

0000110

0011

66.67

133.33

399.96

233

0101

0000101

0111

33.33

166.67

416.67

233

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