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TSB81BA3D Datasheet(PDF) 52 Page - Texas Instruments |
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TSB81BA3D Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 59 page  TSB81BA3D, TSB81BA3DI IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER SLLS559E − DECEMBER 2002 − REVISED JUNE 2006 52 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 27. 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 36 (note that the link request types allowed during this period are a subset of all of the allowed types of link requests—see Table 25). The associated speed codes and packet format are listed in Table 36 and Table 37, 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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