MPC8321EVRADDC datasheet(66/82 Pages) FREESCALE

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MPC8323E PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 4

Freescale Semiconductor

Clocking

The ce_clk frequency is determined by the QUICC Engine PLL multiplication factor (RCWL[CEPMF)

and the QUICC Engine PLL division factor (RCWL[CEPDF]) according to the following equation:

When CLKIN is the primary input clock,

ce_clk = (primary clock input × CEPMF)

÷ (1 + CEPDF)

When PCI_CLK is the primary input clock,

ce_clk = [primary clock input × CEPMF × (1 + ~CFG_CLKIN_DIV)] ÷ (1 + CEPDF)

See the “QUICC Engine PLL Multiplication Factor” section and the “QUICC Engine PLL Division

Factor” section in the MPC8323E PowerQUICC II Pro Communications Processor Reference Manual for

more information.

The DDR SDRAM memory controller operates with a frequency equal to twice the frequency of csb_clk.

Note that ddr_clk is not the external memory bus frequency; ddr_clk passes through the DDR clock divider

(

÷2) to create the differential DDR memory bus clock outputs (MCK and MCK). However, the data rate

is the same frequency as ddr_clk.

The local bus memory controller operates with a frequency equal to the frequency of csb_clk. Note that

lbc_clk is not the external local bus frequency; lbc_clk passes through the LBC clock divider to create the

external local bus clock outputs (LSYNC_OUT and LCLK[0:2]). The LBC clock divider ratio is

controlled by LCRR[CLKDIV]. See the “LBC Bus Clock and Clock Ratios” section in the MPC8323E

PowerQUICC II Pro Communications Processor Reference Manual for more information.

In addition, some of the internal units may be required to be shut off or operate at lower frequency than

the csb_clk frequency. These units have a default clock ratio that can be configured by a memory mapped

frequency. Refer to the “System Clock Control Register (SCCR)” section in the MPC8323E PowerQUICC

II Pro Communications Processor Reference Manual for a detailed description.

NOTE

Setting the clock ratio of these units must be performed prior to any access

to them.

Table 57 provides the operating frequencies for the 8323E PBGA under recommended operating

conditions (see Table 2).

Table 56. Configurable Clock Units

Unit

Default Frequency

Options

Security core, I2C, SAP, TPR

csb_clk

Off,

csb_clk/2, csb_clk/3

PCI and DMA complex

csb_clk

Off,

csb_clk

Table 57. Operating Frequencies for PBGA

Characteristic1

Max Operating Frequency

Unit

e300 core frequency (

core_clk)333

MHz

Coherent system bus frequency (

csb_clk)133

MHz

QUICC Engine frequency (

ce_clk)200

MHz

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