TSB81BA3DI datasheet(52/61 Pages) TI1

52 / 61 page

TSB81BA3D, TSB81BA3DI

IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER

SLLS559E − DECEMBER 2002 − REVISED JUNE 2006

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]

LLC D[0:7]

LLC CTL[0:1]

PHY D[0:7]

PHY CTL[0:1]

LLC D[0:7]

LLC CTL[0:1]

dn−1

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.

TSB81BA3DI Datasheet(PDF) 52 Page - Texas Instruments