MPC8314EEC datasheet(87/101 Pages) FREESCALE

87 / 101 page

MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Clocking

This table provides the operating frequencies for the TEPBGA II under recommended operating

conditions (see Table 2).

23.1

System PLL Configuration

The system PLL is controlled by the RCWL[SPMF] parameter. Table 69 shows the multiplication factor

encodings for the system PLL.

NOTE

If RCWL[DDRCM] and RCWL[LBCM] are both cleared, the system PLL

VCO frequency = (CSB frequency)

 (System PLL VCO Divider).

If either RCWL[DDRCM] or RCWL[LBCM] are set, the system PLL VCO

frequency = 2

 (CSB frequency)  (System PLL VCO Divider).

The VCO divider needs to be set properly so that the System PLL VCO

frequency is in the range of 450–750 MHz.

Table 67. Configurable Clock Units

Unit

Default Frequency

Options

eTSEC1

csb_clk

Off, csb_clk, csb_clk/2, csb_clk/3

eTSEC2

csb_clk

Off, csb_clk, csb_clk/2, csb_clk/3

Security Core, I2C, SAP, TPR

csb_clk

Off, csb_clk, csb_clk/2, csb_clk/3

USB DR

csb_clk

Off, csb_clk, csb_clk/2, csb_clk/3

PCI and DMA complex

csb_clk

Off, csb_clk

PCI Express

csb_clk

Off, csb_clk

Serial ATA

csb_clk

Off, csb_clk, csb_clk/2, csb_clk/3

Table 68. Operating Frequencies for TEPBGA II

Characteristic1

Max Operating Frequency

Unit

e300 core frequency (core_clk)

400

MHz

Coherent system bus frequency (csb_clk)

133

MHz

DDR1/2 memory bus frequency (MCK)2

133

MHz

Local bus frequency (LCLKn)3

MHz

PCI input frequency (SYS_CLK_IN or PCI_CLK)

24-66

MHz

Note:

1. The SYS_CLK_IN frequency, RCWL[SPMF], and RCWL[COREPLL] settings must be chosen such that the resulting csb_clk,

MCK, LCLK[0:1], and core_clk frequencies do not exceed their respective maximum or minimum operating frequencies.

2. The DDR data rate is 2x the DDR memory bus frequency.

3. The local bus frequency is 1/2, 1/4, or 1/8 of the lbiu_clk frequency (depending on LCRR[CLKDIV]) which is in turn 1x or 2x the

csb_clk frequency (depending on RCWL[LBCM]).

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