- 您现在的位置：买卖IC网 > Sheet目录367 > TWR-MPC8309 (Freescale Semiconductor)TOWER SYSTEM MODULE MPC8309
Clocking
23.1
Clocking in PCI host mode
When the MPC8309 is configured as a PCI host device (RCWH[PCIHOST] = 1), SYS_CLK_IN is its
primary input clock. SYS_CLK_IN feeds the PCI clock divider ( ÷ 2) and the PCI_SYNC_OUT and
PCI_CLK multiplexors. The CFG_CLKIN_DIV configuration input selects whether SYS_CLK_IN or
SYS_CLK_IN/2 is driven out on the PCI_SYNC_OUT signal.
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.
23.1.1
PCI clock outputs (PCI_CLK[0:2])
When the MPC8309 is configured as a PCI host, it provides three separate clock output signals,
PCI_CLK[0:2], for external PCI agents.
When the device comes out of reset, the PCI clock outputs are disabled and are actively driven to a steady
low state. Each of the individual clock outputs can be enabled (enable toggling of the clock) by setting its
corresponding OCCR[PCICOE n ] bit. All output clocks are phase-aligned to each other.
23.2
Clocking in PCI agent mode
When the MPC8309 is configured as a PCI agent device, PCI_SYNC_IN is the primary input clock. In
agent mode, the SYS_CLK_IN signal should be tied to GND, and the clock output signals, PCI_CLK n and
PCI_SYNC_OUT, are not used.
23.3
System clock domains
As shown in Figure 45 , the primary clock input (frequency) is multiplied up by the system phase-locked
loop (PLL) and the clock unit to create four major clock domains:
? The coherent system bus clock ( csb_clk )
? The QUICC Engine clock ( qe_clk )
? The internal clock for the DDR controller ( ddr_clk )
? The internal clock for the local bus controller ( lbc_clk )
The csb_clk frequency is derived from the following equation:
csb_clk = [PCI_SYNC_IN × (1 + ~CFG_CLKIN_DIV)] × SPMF
In PCI host mode,
PCI_SYNC_IN = SYS_CLK_IN ÷ (1 + ~ CFG_CLKIN_DIV ) .
Eqn. 1
Eqn. 2
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
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3
66
Freescale Semiconductor
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
TWR-PXN20-KIT
TOWER SYSTEM KIT PXN20
TWR-PXS2010-KIT
TOWER SYSTEM KIT PXS2010
TWR-PXS3020-KIT
TOWER SYSTEM KIT PXS3020
TWR-S08DC-PT60
TOWER SYSTEM BOARD S08PT60
TWR-S08JE128-KIT
KIT TOWER FOR MC9S08JE
TWR-S08LH64
TOWER SYSTEM S08LH64
TWR-S08LL64
TOWER SYSTEM S08LL64
TWR-S08MM128
TOWER SYSTEM BOARD MC9S08MM128
相关代理商/技术参数
TWR-P1025
功能描述:开发板和工具包 - 其他处理器 TOWER MODULE P1025
RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
TWR-P1025-KIT
功能描述:开发板和工具包 - 其他处理器 QORIQ P1 TWR KIT
RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
TWRPI-BLE-DEMO
功能描述:蓝牙/802.15.1 开发工具 TWRPI-BLE-DEMO RoHS:否 制造商:Panasonic Electronic Components 产品:Bluetooth Evaluation Kit 工具用于评估:PAN1721 频率:2.4 GHz 接口类型:I2C 工作电源电压:2 V to 3.6 V
TWRPI-MMA6900
功能描述:加速传感器开发工具 MMA6900 SENSOR PLUG-IN RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V
TWRPI-MMA845XQ
功能描述:加速传感器开发工具 Accel TWRPI
RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V
TWRPI-MPL115A
制造商:Freescale Semiconductor 功能描述:Tower Board Plug-in MPL115A Pressure Sensor 制造商:Freescale Semiconductor 功能描述:MPL115 SENSOR PLUGIN HARDWARE ONLY
TWRPI-PROXIMITY
制造商:Freescale Semiconductor 功能描述:TOWER SYSTEM, PLUG-IN, CAPACITIVE PROXIMITY SENSOR, USE W/TO - Boxed Product (Development Kits) 制造商:Freescale Semiconductor 功能描述:TOUCH BOARD EVALUATION 制造商:Freescale Semiconductor 功能描述:CAP PROXIMITY SENSOR, PLUG-IN BOARD 制造商:Freescale Semiconductor 功能描述:Capacitive Proximity Sensor Plug-In for the Tower System 制造商:Freescale Semiconductor 功能描述:Redesign of TWRPI-MUTRES 制造商:Freescale Semiconductor 功能描述:SENSOR PLUG-IN, TOWER SYSTEMS, Accessory Type:Capacitive Proximity Sensor Plug-In, For Use With:Freescale Tower Systems, Features:Proximity Detection upto 1", 4 Discrete Touch-sensing Electrodes, Compatible with TSS 3.1
TWRPI-ROTARY
制造商:Freescale Semiconductor 功能描述:TOWER SYSTEM, PLUG-IN, CAPACITIVE TOUCH ROTARY, USE W/TOWER - Bulk 制造商:Freescale Semiconductor 功能描述:HDWR ROTARY PLUG-IN FOR TOWER 制造商:Freescale Semiconductor 功能描述:TWRPI-ROTARY