参数资料
型号: MPC8308-SOM
厂商: Freescale Semiconductor
文件页数: 36/83页
文件大小: 0K
描述: MODULE BOARD FOR MPC8308
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8308
所含物品:
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor
41
Enhanced Local Bus
NOTE
The reference impedance for return loss measurements is 50
to ground for
both the D+ and D- line (that is, as measured by a Vector Network Analyzer
with 50
probes—see Figure 29). Note that the series capacitors,
CPEACCTX, are optional for the return loss measurement.
Figure 28. Minimum Receiver Eye Timing and Voltage Compliance Specification
11.5.1
Compliance Test and Measurement Load
The AC timing and voltage parameters must be verified at the measurement point, as specified within
0.2 inches of the package pins, into a test/measurement load shown in Figure 29.
NOTE
The allowance of the measurement point to be within 0.2 inches of the
package pins is meant to acknowledge that package/board routing may
benefit from D+ and D– not being exactly matched in length at the package
pin boundary.
Figure 29. Compliance Test/Measurement Load
12 Enhanced Local Bus
This section describes the DC and AC electrical specifications for the enhanced local bus interface.
VRX-DIFFp-p-MIN > 175 mV
0.4 UI = TRX-EYE-MIN
VRX-DIFF = 0 mV
(D+ D– Crossing Point)
VRX-DIFF = 0 mV
(D+ D– Crossing Point)
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