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參數(shù)資料
| 型號： | MPC8308CZQAGD |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 266 MHz, MICROPROCESSOR, PBGA473 |
| 封裝： | 19 X 19 MM, 0.80 MM PITCH, 1.39 MM HEIGHT, MAPBGA-473 |
| 文件頁數(shù)： | 83/88頁 |
| 文件大?。?/td> | 2550K |
| 代理商： | MPC8308CZQAGD |
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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1
84
Freescale Semiconductor
System Design Information
Figure 55. Driver Impedance Measurement
The value of this resistance and the strength of the driver’s current source can be found by making two
measurements. First, the output voltage is measured while driving logic 1 without an external differential
termination resistor. The measured voltage is V1 = Rsource × Isource. Second, the output voltage is measured
while driving logic 1 with an external precision differential termination resistor of value Rterm. The
measured voltage is V2 =(1/(1/R1 +1/R2)) × Isource. Solving for the output impedance gives Rsource =
Rterm × (V1/V2 – 1). The drive current is then Isource =V1/Rsource.
nominal NVDD, 105°C.
23.6
Configuration Pin Muxing
The device provides the user with power-on configuration options that can be set through the use of
external pull-up or pull-down resistors of 4.7 K
Ω on certain output pins (see customer-visible
configuration pins). These pins are generally used as output-only pins in normal operation.
While PORESET is asserted, these pins are treated as inputs. The value presented on these pins while
PORESET is asserted is latched when PORESET deasserts, at which time the input receiver is disabled
and the I/O circuit takes on its normal function. Careful board layout with stubless connections to these
pull-up/pull-down resistors coupled with the large value of the pull-up/pull-down resistor should minimize
the disruption of signal quality or speed for output pins thus configured.
Table 60. Impedance Characteristics
Impedance
Local Bus, Ethernet, DUART, Control,
Configuration, Power Management
DDR DRAM
Symbol
Unit
RN
42 Target
20 Target
Z0
Ω
RP
42 Target
20 Target
Z0
Ω
NVDD
VSS
RP
RN
Pad
Data
SW1
SW2
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|---|---|
| MPC8308CZQAGDA | 功能描述:微處理器 - MPU E300 EXT TEMP PB 400 RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:536 MHz 程序存儲器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| MPC8308-KIT | 功能描述:開發(fā)板和工具包 - 其他處理器 For MPC8308 Ethernet USB I2C SPI RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MPC8308-NSG | 功能描述:開發(fā)板和工具包 - 其他處理器 MPC8308-NSG RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MPC8308-NSG | 制造商:Freescale Semiconductor 功能描述:MPC8308-NSG*NIC* |
| MPC8308-RDB | 功能描述:開發(fā)板和工具包 - 其他處理器 Refer. Board MPC8308 RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
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