参数资料
型号: KMPC8347VVAJFB
厂商: Freescale Semiconductor
文件页数: 93/99页
文件大小: 0K
描述: IC MPU PWRQUICC II 672-TBGA
标准包装: 2
系列: MPC83xx
处理器类型: 32-位 MPC83xx PowerQUICC II Pro
速度: 533MHz
电压: 1.2V
安装类型: 表面贴装
封装/外壳: 672-LBGA
供应商设备封装: 672-TBGA(35x35)
包装: 托盘
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12
Freescale Semiconductor
93
System Design Information
OVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are designed to be close to each
other in value. Then, Z0 = (RP + RN) ÷ 2.
Figure 44. Driver Impedance Measurement
Two measurements give the value of this resistance and the strength of the driver current source. 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.
Table 69 summarizes the signal impedance targets. The driver impedance are targeted at minimum VDD,
nominal OVDD, 105°C.
21.6
Configuration Pin Multiplexing
The MPC8347EA power-on configuration options can be set through external pull-up or pull-down
resistors of 4.7 k
Ω on certain output pins (see the customer-visible configuration pins). These pins are used
as output only pins in normal operation.
Table 69. Impedance Characteristics
Impedance
Local Bus, Ethernet,
DUART, Control,
Configuration, Power
Management
PCI Signals
(Not Including PCI
Output Clocks)
PCI Output Clocks
(Including
PCI_SYNC_OUT)
DDR DRAM
Symbol
Unit
RN
42 Target
25 Target
42 Target
20 Target
Z0
W
RP
42 Target
25 Target
42 Target
20 Target
Z0
W
Differential
NA
ZDIFF
W
Note: Nominal supply voltages. See Table 1, Tj = 105°C.
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
相关PDF资料
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KMPC8347EZUAGDB IC MPU PWRQUICC II 672-TBGA
345-010-541-204 CARDEDGE 10POS DUAL .100 GREEN
XF2U-2715-3A CONNECTOR FPC 27POS 0.5MM SMD
KMPC8347EZUAJFB IC MPU PWRQUICC II 672-TBGA
345-010-541-202 CARDEDGE 10POS DUAL .100 GREEN
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