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USB3.2超高速GEN1、GEN2特殊符号（symbol）和链路管理

发布时间：2022-11-19 03:22:29所属栏目：USB3.2超高速协议规范 已帮助人编辑作者：【USB接口百科】

8b/10b编码方案提供与数据不同的特殊符号（symbol）用来表示字符的符号。这些特殊符号用于各种链接管理机制。
特殊符号应遵循适当的8b/10b差异规则。

对于GEN2，块头标识如果以下16个符号代表数据，则它们具有特殊含义。在GEN2中，当是控制块的一部分,接收机在接收特殊符号时，应始终对其进行单比特纠错。对于1代和2代，定义了以下特殊符号。

Symbol Name “Gen 1 Symbol” “Gen 2 Symbol” Description
SKP Skip K28.1 CCh “Compensates for different bit rates between two communicating ports. SKPs may be dynamically inserted or removed from the data stream. For Gen 2 operation, unscrambled.”
SKPEND Skip End “Not applicable” 33h “Marks the boundary between SKP symbols and the remainder of the SKP OS. Unscrambled.”
SDP “Start Data Packet” K28.2 96h “Marks the start of a Data Packet Payload. For Gen 2 operation, scrambled and transmitted only in data block.”
EDB End Bad K28.3 69h “Marks the end of a nullified Packet. For Gen 2 operation, scrambled and transmitted only in data block.”
SUB “Decode Error Substitution” K28.4 “Not applicable” “Symbol substituted by the 8b/10b decoder when a Decode error is detected.”
COM Comma K28.5 “Not applicable” Used for symbol alignment.
——- ——- K28.6 “Not applicable” Reserved
SHP “Start Header Packet” K27.7 9Ah “Marks the start of a Data Packet (Gen 1 operation only), Transaction Packet or Link Management Packet. For Gen 2 operation, scrambled and transmitted only in data block.”
DPHP “Start Data Packet Header” “Not applicable” 95h “Marks the start of a Data Packet (Gen 2 only).Scrambled and transmitted only in data block.”
END End K29.7 65h “Marks the end of a packet. For Gen 2 operation, scrambled and transmitted only in data block.”
SLC “Start Link Command” K30.7 4Bh “Marks the start of a Link Command. For Gen 2 operation, scrambled and transmitted only in data block.”
EPF “End Packet Framing” K23.7 36h “Marks the end of a packet framing. For Gen 2 operation, scrambled and transmitted only in datablock.”
SDS “Start of Data Stream” “Not applicable” E1h “Marks the start of an SDS Ordered Set.Unscrambled.”

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