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| 型号： | MPC8308VMAGDA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | RISC MICROCONTROLLER, PBGA473 |
| 封装： | 19 X 19 MM, 1.39 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MABGA-473 |
| 文件页数： | 75/90页 |
| 文件大小： | 1123K |
| 代理商： | MPC8308VMAGDA |
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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
Freescale Semiconductor
77
Clocking
21.1
System Clock Domains
The primary clock input (SYS_CLK_IN) frequency is multiplied up by the system phase-locked loop
(PLL) and the clock unit to create three major clock domains:
The coherent system bus clock (csb_clk)
The internal clock for the DDR controller (ddr_clk)
The internal clock for the local bus interface unit (lbc_clk)
The csb_clk frequency is derived as follows:
csb_clk = [SYS_CLK_IN] × SPMF
The csb_clk serves as the clock input to the e300 core. A second PLL inside the core multiplies up the
csb_clk frequency to create the internal clock for the 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. For more information, see the Reset
Clock Configuration chapter in the MPC8308 PowerQUICC II Pro Processor Reference Manual.
The DDR SDRAM memory controller will operate 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 will operate 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 LCLK0:2). The LBC clock divider ratio is controlled
by LCCR[CLKDIV]. For more information, see the Reset Clock Configuration chapter in the MPC8308
PowerQUICC II Pro Processor Reference Manual.
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
register after the device comes out of reset. Table 54 specifies which units have a configurable clock
frequency. For more information, see Reset Clock Configuration chapter in the MPC8308 PowerQUICC
II Pro Processor Reference Manual.
NOTE
The clock ratios of these units must be set before they are accessed.
Table 54. Configurable Clock Units
Unit
Default Frequency
Options
eTSEC1,eTSEC2
csb_clk/3
Off,
csb_clk, csb_clk/2, csb_clk/3
I2C
csb_clk
Off,
csb_clk,csb_clk/2, csb_clk/3
DMA complex
csb_clk
Off,
csb_clk,csb_clk/2,csb_clk/3
PCIEXP
csb_clk
Off,
csb_clk, csb_clk/2, csb_clk/3
eSDHC
csb_clk
Off
, csb_clk, csb_clk/2, csb_clk/3
USB
csb_clk
Off
, csb_clk, csb_clk/2, csb_clk/3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC8308ZQADD | 功能描述:微处理器 - MPU E300 MP Pb 266 RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8308ZQADDA | 功能描述:微处理器 - MPU E300 MP Pb 266 RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8308ZQAFD | 功能描述:微处理器 - MPU E300 MP Pb 333 RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8308ZQAFDA | 功能描述:微处理器 - MPU E300 MP Pb 333 RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8308ZQAGD | 功能描述:微处理器 - MPU E300 MP Pb 400 RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
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