Pcie 协议理解
1. OBFF Mechanism= Optimized Buffer Flush/Fill (OBFF) Mechanismcite from: 《PCI EXPRESS BASE SPECIFICATION, REV. 3.1a 》
The Optimized Buffer Flush/Fill (OBFF) Mechanism enables a Root Complex to report to
Endpoints (throughout a hierarchy) time windows when the incremental platform power cost for
Endpoint bus mastering and/or interrupt activity is relatively low.
“OBFF” – System memory path available for Device memory read/write bus master activities
2. PRSNT 信号如何连线？
PRSNT1_N
PRSNT2_N_X1
PRSNT2_N_X4
PRSNT2_N_X8
PRSNT2_N_X16 需要学习《PCI_Express_CEM_r3.0_008152013_TS_Clean.pdf》
2. SlimSAS的这个信号作用，BP_TYPEB；
解决：
基于《SFF-8448_R1.3b.pdf》，
Vendor Specific Pins (VSP)
3.PCIE的3V3_VAUX电流大小：
来自：《PCI Express ® Base Specification Revision 3.1a December 7, 2015 》
PCI Express ® Card Electromechanical Specification Revision 3.0
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