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參數(shù)資料
| 型號： | MPC8347ECZQAGF |
| 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, RISC PROCESSOR, PBGA620 |
| 封裝： | 29 X 29 MM, 2.46 MM HEIGHT, 1 MM PITCH, PLASTIC, BGA-620 |
| 文件頁數(shù)： | 78/102頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | MPC8347ECZQAGF |
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MPC8347E PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 11
Freescale Semiconductor
77
Clocking
As shown in Figure 41, the primary clock input (frequency) is multiplied up by the system phase-locked
loop (PLL) and the clock unit to create the coherent system bus clock (csb_clk), the internal clock for the
DDR controller (ddr_clk), and the internal clock for the local bus interface unit (lbiu_clk).
The csb_clk frequency is derived from a complex set of factors that can be simplified into the following
equation:
csb_clk = {PCI_SYNC_IN × (1 + CFG_CLKIN_DIV)} × SPMF
In PCI host mode, PCI_SYNC_IN × (1 + CFG_CLKIN_DIV) is the CLKIN frequency.
The csb_clk serves as the clock input to the e300 core. A second PLL inside the e300 core multiplies the
csb_clk frequency to create the internal clock for the e300 core (core_clk). The system and core PLL
multipliers are selected by the SPMF and COREPLL fields in the reset configuration word low (RCWL),
which is loaded at power-on reset or by one of the hard-coded reset options. See the chapter on reset,
clocking, and initialization in the MPC8349E Reference Manual for more information on the clock
subsystem.
The internal ddr_clk frequency is determined by the following equation:
ddr_clk = csb_clk × (1 + RCWL[DDRCM])
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 internal lbiu_clk frequency is determined by the following equation:
lbiu_clk = csb_clk × (1 + RCWL[LBIUCM])
lbiu_clk is not the external local bus frequency; lbiu_clk passes through the LBIU clock divider to create
the external local bus clock outputs (LSYNC_OUT and LCLK[0:2]). The LBIU clock divider ratio is
controlled by LCCR[CLKDIV].
In addition, some of the internal units may have to be shut off or operate at lower frequency than the
csb_clk frequency. Those units have a default clock ratio that can be configured by a memory-mapped
register after the device exits reset. Table 53 specifies which units have a configurable clock frequency.
Table 53. Configurable Clock Units
Unit
Default
Frequency
Options
TSEC1
csb_clk/3
csb_clk, csb_clk/2, csb_clk/3
TSEC2, I2C1
csb_clk/3
Off,
csb_clk, csb_clk/2, csb_clk/3
Security core
csb_clk/3
Off,
csb_clk, csb_clk/2, csb_clk/3
USB DR, USB MPH
csb_clk/3
Off, csb_clk, csb_clk/2,
csb_clk/3
PCI and DMA complex
csb_clk
Off,
csb_clk
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MPC8347ECZQAGFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications |
| MPC8347ECZQAJDB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications |
| MPC8347ECZQAJFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications |
| MPC8347ECZQALDB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications |
| MPC8347ECZQALFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications |
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