MPC8321E Freescale Semiconductor, Inc, MPC8321E Datasheet - Page 62

• Manufacturer Part Number: MPC8321E
• Description: Mpc8321e Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

Clocking
22 Clocking
Figure 43
The primary clock source for the MPC8323E can be one of two inputs, CLKIN or PCI_CLK, depending
on whether the device is configured in PCI host or PCI agent mode, respectively.
22.1
When the MPC8323E is configured as a PCI host device (RCWH[PCIHOST] = 1), CLKIN is its primary
input clock. CLKIN feeds the PCI clock divider (÷2) and the PCI_SYNC_OUT and PCI_CLK_OUT
62
CFG_CLKIN_DIV
MPC8323E PowerQUICC™ II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
Clocking in PCI Host Mode
shows the internal distribution of clocks within the MPC8323E.
CLKIN
MPC8323E
QUICC Engine
ce_clk to
QUICC
Engine
Block
PLL
System
PLL
Figure 43. MPC8323E Clock Subsystem
e300c2 core
Divider (÷2)
PCI Clock
Clock
csb_clk
Unit
csb_clk to Rest
of the Device
ddr_clk
lb_clk
Core PLL
To Local Bus
Controller
Memory
To DDR
Divider
Divider
Clock
Clock
/n
DDR
LBC
core_clk
/2
2
2
3
PCI_CLK_OUT[0:2]
LCLK[0:1]
MEMC1_MCK
MEMC1_MCK
PCI_CLK/
PCI_SYNC_IN
PCI_SYNC_OUT
Freescale Semiconductor
Local Bus
Memory
Device
DDR
Memory
Device