参数资料
型号: MPC8541CPXAJEX
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1600 MHz, RISC PROCESSOR, CBGA360
封装: 25 X 25 MM, 2.40 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, HCTE, CERAMIC, BGA-360
文件页数: 75/84页
文件大小: 1241K
代理商: MPC8541CPXAJEX
MPC8541E PowerQUICC III Integrated Communications Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
77
System Design Information
When data is held high, SW1 is closed (SW2 is open) and RP is trimmed until the voltage at the pad equals
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 49. 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
× (V
1/V2 – 1). The drive current is then Isource =V1/Rsource.
Table 50 summarizes the signal impedance targets. The driver impedance are targeted at minimum VDD,
nominal OVDD, 105°C.
Table 50. Impedance Characteristics
Impedance
Local Bus, Ethernet,
DUART, Control,
Configuration, Power
Management
PCI
DDR DRAM
Symbol
Unit
RN
43 Target
25 Target
20 Target
Z0
Ω
RP
43 Target
25 Target
20 Target
Z0
Ω
Differential
NA
ZDIFF
Ω
Note: Nominal supply voltages. See Table 1, Tj = 105°C.
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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