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
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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