MPC8378CVRAGDA datasheet(108/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

108

Freescale Semiconductor

Clocking

Table 69 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 RCWL[SPMF] parameter. The system PLL VCO frequency depends

on RCWL[DDRCM] and RCWL[LBCM]. Table 70 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 400–800 MHz.

Table 69. Operating Frequencies for TePBGA II

Parameter 1

The CLKIN frequency, RCWL[SPMF], and RCWL[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 (LCLK

n) 3

The local bus frequency is 1/2, 1/4, or 1/8 of the

lbiu_clk frequency (depending on LCCR[CLKDIV]) which is in turn 1x or 2x

the

csb_clk frequency (depending on RCWL[LBIUCM]).

—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

PCI Express controller frequency

—

400

Note:

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