MPC8379E datasheet(99/116 Pages) FREESCALE

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MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Clocking

Table 71 provides the operating frequencies for the TePBGA II package under recommended operating

conditions (see Table 3).

22.1

System PLL Configuration

The system PLL is controlled by the RCWLR[SPMF] parameter. The system PLL VCO frequency

depends on RCWLR[DDRCM] and RCWLR[LBCM]. Table 72 shows the multiplication factor encodings

for the system PLL.

NOTE

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

PLL VCO frequency = (CSB frequency)

× (System PLL VCO Divider).

If either RCWLR[DDRCM] or RCWLR[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 400–800 MHz.

Table 71. Operating Frequencies for TePBGA II

Parameter 1

The CLKIN frequency, RCWLR[SPMF], and RCWLR[COREPLL] settings must be chosen such that the resulting csb_clk,

MCK, LCLK[0:2], and core_clk frequencies do not exceed their respective maximum or minimum operating frequencies. The

value of SCCR[xCM] must be programmed such that the maximum internal operating frequency of the Security core, USB

modules, SATA, and eSDHC will not exceed their respective value listed in this table.

Minimum Operating

Frequency (MHz)

Maximum Operating

Frequency (MHz)

e300 core frequency (core_clk)333

800

Coherent system bus frequency (csb_clk)133

400

DDR2 memory bus frequency (MCK) 2

The DDR data rate is 2

× the DDR memory bus frequency.

125

200

DDR1 memory bus frequency (MCK) 2

167

333

Local bus frequency (LCLKn) 3

The local bus frequency is ½, ¼, or 1/8 of the lbiu_clk frequency (depending on LCRR[CLKDIV]) which is in turn 1× or 2× the

csb_clk frequency (depending on RCWLR[LBCM]).

—133

Local bus controller frequency (lbc_clk)—

400

PCI input frequency (CLKIN or PCI_CLK)

eTSEC frequency

—

400

Security encryption controller frequency

—

200

USB controller frequency

—

200

eSDHC controller frequency

—

200

SATA controller frequency

—

200

Note:

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