TSB41BA3B Datasheet, PDF (60/67 Pages) Texas Instruments – IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER

TSB41BA3B
IEEE 1394b THREEĆPORT CABLE TRANSCEIVER/ARBITER
SLLS678 − SEPTEMBER 2005
PRINCIPLES OF OPERATION (1394b INTERFACE) (continued)
transmit (continued)
PHY CTL[0:1]
00
11
00
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
PHY D[0:7]
00
GT
00
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
LLC CTL[0:1]
ZZ
ZZ
ZZ
ZZ
LLC D[0:7]
ZZ
ZZ
ZZ
ZZ
ZZ
11
ZZ
00
11
01
01
00
d0
d1
PHY CTL[0:1]
PHY D[0:7]
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
ZZ
00
00
00
ZZ
00
00
00
LLC CTL[0:1]
01
01
11
00
ZZ
ZZ
ZZ
ZZ
ZZ
LLC D[0:7]
dn−1
dn
LR
00
ZZ
ZZ
ZZ
ZZ
ZZ
GT = grant type LR = link request type d0−dn = packet data
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 38 (note that the link request types allowed during this
period are a subset of all of the allowed types of link requests—see Table 27). The associated speed codes and
packet format are listed in Table 38 and Table 39, 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.
60
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265