Datasheet

TSB81BA3D, TSB81BA3DI
IEEE 1394b THREE-PORT 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 ZZZZ
00 GT 00 ZZ ZZ ZZ ZZ ZZZZ
LLC D[0:7]
LLC CTL[0:1]
ZZ ZZ ZZ ZZ ZZ 11 01 0111
ZZ ZZ ZZ ZZ ZZ 00 d
0
d
1
00
PHY D[0:7]
PHY CTL[0:1]
ZZ ZZ ZZ ZZ ZZ 00 0000
LLC D[0:7]
LLC CTL[0:1]
ZZ
ZZ ZZ ZZ ZZ ZZ 00 0000ZZ
01 01 11 00 ZZ ZZ ZZZZZZ
d
n−1
d
n
LR 00 ZZ ZZ ZZZZZZ
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.