Datasheet

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
TSB81BA3E
www.ti.com SLLS783A –MAY 2009–REVISED MAY 2010
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.
Table 36. Link Request Type Encoding During Packet
Transmission
D1D3 REQUEST TYPE
000 No request
001 Isoch_Req_Odd
010 Isoch_Req_Even
011 Current
100 Next_Even
101 Next_Odd
110 Cyc_Start_Req
111 Reserved
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