TSB81BA3EPFP datasheet(49/57 Pages) TI

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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

TSB81BA3E

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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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