TLK3134_1 Datasheet, PDF (44/150 Pages) Texas Instruments – 4-Channel Multi-Rate Transceiver

TLK3134
4-Channel Multi-Rate Transceiver
SLLS838D – MAY 2007 – REVISED JULY 2008
reset
||T|| &
nextAK= K
+ Acnt != 0
Any State
!(||idle|| + ||Q||)
Send Data
||T|| &
nextAK= A *
Acnt= 0
www.ti.com
Send K
!||Q||
Send A
Acnt != 0 *
nextKR = R
Send R
Acnt != 0 *
nextKR = K
Acnt != 0 *
nextKR = K
Send K
Acnt = 0
Acnt != 0 *
nextKR = R _{!||Q|| *}
nextKR = R
Acnt = 0
Send A
!||Q|| *
nextKR = K
||Q||
Send Q
nextKR = R
||Q||
Send Q
nextKR = K
Figure 2-27. IPG Management State Machine
Table 2-18. IPG Management State Machine Notation
SYMBOL
||idle||
||Q||
nextAK
Acnt
nextKR
||T||
DEFINITION
XGMII idle. 0x07 on TXD(x:: :x-7),
Link status message: K28.4, Dx.y, Dx.y, Dx.y.
A Boolean variable. It takes the value K when an A is sent at the beginning of the
IPG and the value A when a K is sent at the beginning of the IPG. Its initial value is
K.
When an A character is sent, variable Acnt is loaded with a random number such
that 16 ≤ Acnt ≤ 31. Acnt is decremented each time a column of A characters is
generated.
A randomly-generated Boolean that can assume the value K or R.
Terminate Character Column (Terminate Character in Any Lane).
2.7.26 Clock Tolerance Compensation (CTC)
The XAUI interface is defined to allow for separate clock domains on each side of the link. Though the
reference clocks for two devices on a XAUI link have the same specified frequencies, there are slight
differences that, if not compensated for, will lead to over or under run of the FIFOs on the receive/transmit
data path. The TLK3134 provides compensation for these differences in clock frequencies via the insertion
or the removal of /R/ characters on all channels, as shown in Figure 2-28 and Figure 2-29.
44
Detailed Description
Submit Documentation Feedback