TSB41BA3APFP datasheet(60/66 Pages) TI

60 / 66 page

TSB41BA3A

IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER

SLLS618B − JUNE 2004 − REVISED AUGUST 2004

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 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.

TSB41BA3APFP Datasheet(PDF) 60 Page - Texas Instruments