TSB41BA3DIPFP datasheet(52/59 Pages) TI

52 / 59 page

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

TSB41BA3D

SLLS959A – DECEMBER 2008 – REVISED MARCH 2009 ............................................................................................................................................... www.ti.com

bits of packet data on the D lines. The transmit state is held on the CTL terminals until the last bits of data have

been sent. The LLC then asserts either hold or idle on the CTL terminals for one clock cycle. If the hold is

asserted, then the hold is immediately followed by one clock cycle of idle. The link then releases the PHY-link

interface by putting the CTL and D terminals in a high-impedance state. The PHY then regains control of the

PHY-link interface.

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 39 (note that the link request types allowed during this

period are a subset of all of the allowed types of link requests—see Table 28). The associated speed codes and

packet format are listed in Table 39 and Table 40, 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.

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