TLK1201RCP Datasheet, PDF (14/25 Pages) Texas Instruments – ETHERNET TRANSCEIVERS

TLK1201RCP, TLK1201IRCP
ETHERNET TRANSCEIVERS
SLLS506E − AUGUST 2001 − REVISED MAY 2007
APPLICATION INFORMATION
8B/10B transmission code
The PCS maps GMII signals into 10-bit code groups and vice versa, using an 8b/10b block coding scheme. The
PCS uses the transmission code to improve the transmission characteristics of information to be transferred
across the link. The encoding defined by the transmission code ensures that sufficient transitions are present
in the PHY bit stream to make clock recovery possible in the receiver. Such encoding also greatly increases
the likelihood of detecting any single or multiple bit errors that may occur during transmission and reception of
information. The 8b/10b transmission code specified for use has a high-transition density, is run length limited,
and is dc-balanced. The transition density of the 8b/10b symbols range from 3 to 8 transitions per symbol. The
definition of the 8b/10b transmission code is specified in IEEE 802.3 gigabit ethernet and ANSI X3.230-1994
(FC−PH), clause 11.
14
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265