參數(shù)資料
型號: MPC8379ECVRANGA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA689
封裝: 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數(shù): 110/114頁
文件大?。?/td> 1337K
代理商: MPC8379ECVRANGA
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
95
Clocking
22 Clocking
Figure 61 shows the internal distribution of clocks within the MPC8379E.
Figure 61. MPC8379E Clock Subsystem
The primary clock source for the device can be one of two inputs, CLKIN or PCI_CLK, depending on
whether the device is configured in PCI host or PCI agent mode. When the device is configured as a PCI
host device, CLKIN is its primary input clock. CLKIN feeds the PCI clock divider (
÷2) and the
multiplexors for PCI_SYNC_OUT and PCI_CLK_OUT. The CFG_CLKIN_DIV configuration input
selects whether CLKIN or CLKIN/2 is driven out on the PCI_SYNC_OUT signal. The OCCR[PCICOEn]
parameters select whether CFG_CLKIN_DIV is driven out on the PCI_CLK_OUTn signals.
PCI_SYNC_OUT is connected externally to PCI_SYNC_IN to allow the internal clock subsystem to
synchronize to the system PCI clocks. PCI_SYNC_OUT must be connected properly to PCI_SYNC_IN,
with equal delay to all PCI agent devices in the system, to allow the device to function. When the device
is configured as a PCI agent device, PCI_CLK is the primary input clock. When the device is configured
as a PCI agent device the CLKIN signal should be tied to GND.
Core PLL
System PLL
DDR
LBIU
LSYNC_IN
LSYNC_OUT
LCLK[0:2]
MCK[0:5]
core_clk
e300 core
csb_clk to rest
CLKIN
csb_clk
6
DDR
Memory
Local Bus
PCI_CLK[0:4]
PCI_SYNC_OUT
PCI_CLK/
Clock
Unit
of the device
ddr_clk
lbiu_clk
CFG_CLKIN_DIV
PCI Clock
PCI_SYNC_IN
Device
Memory
Device
/n
to local bus
memory
controller
to DDR
memory
controller
DLL
Clock
Div
/2
Divider
5
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