参数资料
型号: MPC8379E-MDS-PB
厂商: Freescale Semiconductor
文件页数: 93/117页
文件大小: 0K
描述: BOARD PROCESSOR FOR MDS S
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8379
所含物品:
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
77
occurs in the 1–15 MHz range. The source impedance of the clock driver should be 50
Ω to match the
transmission line and reduce reflections which are a source of noise to the system.
This table describes some AC parameters common to SATAprotocols
Figure 57. Differential Measurement Points for Rise and Fall Time
Figure 58. Single-Ended Measurement Points for Rise and Fall Time Matching
Table 68. SerDes Reference Clock Common AC Parameters
At recommended operating conditions with XVDD_SRDS or XVDD_SRDS = 1.0 V ± 5%.
Parameter
Symbol
Min
Max
Unit
Note
Rising Edge Rate
Rise Edge Rate
1.0
4.0
V/ns
Falling Edge Rate
Fall Edge Rate
1.0
4.0
V/ns
Differential Input High Voltage
VIH
200
mV
Differential Input Low Voltage
VIL
–200
mV
Rising edge rate (SD
n_REF_CLK) to falling edge rate
(SD
n_REF_CLK) matching
Rise-Fall Matching
20
%
Notes:
1. Measurement taken from single ended waveform.
2. Measurement taken from differential waveform.
3. Measured from –200 mV to +200 mV on the differential waveform (derived from SD
n_REF_CLK minus SDn_REF_CLK).
The signal must be monotonic through the measurement region for rise and fall time. The 400 mV measurement window is
centered on the differential zero crossing. See Figure 57.
4. Matching applies to rising edge rate for SD
n_REF_CLK and falling edge rate for SDn_REF_CLK. It is measured using a
200 mV window centered on the median cross point where SDn_REF_CLK rising meets SD
n_REF_CLK falling. The
median cross point is used to calculate the voltage thresholds the oscilloscope is to use for the edge rate calculations. The
Rise Edge Rate of SD
n_REF_CLK should be compared to the Fall Edge Rate of SDn_REF_CLK, the maximum allowed
difference should not exceed 20% of the slowest edge rate. See Figure 58.
VIH = +200 mV
0.0 V
VIL = –200 mV
SD
n_REF_CLK
Minus
SD
n_REF_CLK
Rise Edge Rate
Fall Edge Rate
TFALL TRISE
SD
n_REF_CLK
VCROSS MEDIAN
SD
n_REF_CLK
SD
n_REF_CLK
VCROSS MEDIAN
SD
n_REF_CLK
VCROSS MEDIAN –100 mV
VCROSS MEDIAN +100 mV
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