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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VSC7440 датащи(PDF) 37 Page - Microsemi Corporation |
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VSC7440 датащи(HTML) 37 Page - Microsemi Corporation |
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37 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 20 The IFH is only used to control the rewriter on front ports or send to CPU. It is not transmitted with the frame. For CPU ports, the information in the extraction IFH is for reference purposes only. 3.3.3 VStaX Header When frames are sent to or from the NPI port, or when connecting multiple switches together, an optional VStaX header is inserted into the frames. The VStaX header consists of a 10-byte payload and is preceded by 2 bytes for the Microsemi EtherType (0x8880). That is, a total of 12 bytes are inserted into the frame, as shown in the following illustration. Figure 6 • Frame With VStaX Header The layout of the 10-byte VStaX header is shown in the following illustration. In VStaX context, each switch in a stack is termed a unit. QOS TRANSP_DSCP 7 1 bit Controlled by CPU or ANA_CL:PORT:QOS_CFG. DSCP_KEEP_ENA and prevents the rewriter from remapping DSCP values of frames sent to front ports when set. UPDATE_DSCP 6 1 bit Controlled by CPU, ANA_CL:PORT:QOS_CFG DSCP_REWR_MODE_SEL, CLM DSCP_ENA or ANA_CL:MAP_TBL: SET_CTRL.DSCP_ENA and causes the rewriter to update the frame’s DSCP value with IFH.QOS.DSCP for frames sent to front ports when set. DSCP 5:0 6 bits DSCP value. Table 2 • Internal Frame Header Fields (continued) Field Category Field Name Bit Width Description DMAC SMAC 0x8880 VStaX Header, bit 79-0 Preamble Frame Data FCS Bit 79 Bit 0 Microsemi EtherType |
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