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TSB41BA3ATPFPEP 데이터시트(PDF) 60 Page - Texas Instruments |
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TSB41BA3ATPFPEP 데이터시트(HTML) 60 Page - Texas Instruments |
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60 / 68 page ![]() TSB41BA3A-EP IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER SGLS253B—OCTOBER 2004—REVISED MAY 2011 60 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION (1394b INTERFACE) transmit (continued) GT = Grant Type LR = Link Request Type d0−dn = packet data PHY D[0:7] PHY CTL[0:1] 00 11 00 ZZ ZZ ZZ ZZ ZZ ZZ 00 GT 00 ZZ ZZ ZZ ZZ ZZ ZZ LLC D[0:7] LLC CTL[0:1] ZZ ZZ ZZ ZZ ZZ 11 01 01 11 ZZ ZZ ZZ ZZ ZZ 00 d0 d1 00 PHY D[0:7] PHY CTL[0:1] ZZ ZZ ZZ ZZ ZZ 00 00 00 LLC D[0:7] LLC CTL[0:1] ZZ ZZ ZZ ZZ ZZ ZZ 00 00 00 ZZ 01 01 11 00 ZZ ZZ ZZ ZZ ZZ dn−1 dn LR 00 ZZ ZZ ZZ ZZ ZZ Figure 29. Transmit Packet Timing With Optional Link Request The hold state asserted at the end of packet transmission allows the LLC to make an additional link request for packet transmission and/or to notify the PHY that the packet marks the end of a subaction. The link requests allowed after packet transmission are listed in Table 37 (note that the link request types allowed during this period are a subset of all of the allowed types of link requests—see Table 26). The associated speed codes and packet format are listed in Table 37 and Table 38, respectively. If the LLC requests to send an additional packet, then the PHY does not necessarily have to grant the request. If the LLC is notifying the PHY of the end of a subaction, then the LLC sets D4 during the hold state at the end of packet transmission. |
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