Datasheet
Table Of Contents
- FEATURES
- DESCRIPTION
- DESCRIPTION (Continued)
- Differences Between TLK2201B, TLK2201BI, and TNETE2201
- BLOCK DIAGRAM
- DETAILED DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DISSIPATION RATINGS
- THERMAL CHARACTERISTICS
- RECOMMENDED OPERATING CONDITIONS
- TLK2201B REFERENCE CLOCK (REFCLK) TIMING REQUIREMENTS
- TLK2201BI REFERENCE CLOCK (REFCLK) TIMING REQUIREMENTS
- TTL ELECTRICAL CHARACTERISTICS
- TRANSMITTER/RECEIVER CHARACTERISTICS
- LVTTL OUTPUT SWITCHING CHARACTERISTICS
- TRANSMITTER TIMING REQUIREMENTS
- APPLICATION INFORMATION
www.ti.com
APPLICATION INFORMATION
8B/10B TRANSMISSION CODE
_
+
VDD
GND
5kΩ
7.5kΩ
RXP
RXN
GND
5kΩ
7.5kΩ
VDD
Z
O
Z
O
Z
O
Z
O
TXP
TXN
Transmitter Media Receiver
_
+
VDD
GND
5kΩ
7.5kΩ
RXP
RXN
GND
5kΩ
7.5kΩ
VDD
Z
O
Z
O
Z
O
Z
O
TXP
TXN
Transmitter Media Receiver
TLK2201B
TLK2201BI
SLLS585C – NOVEMBER 2003 – REVISED FEBRUARY 2008
The PCS maps GMII signals into ten-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 ranges 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.
8b/10b transmission code uses letter notation describing the bits of an unencoded information octet. The bit
notation of A,B,C,D,E,F,G,H for an unencoded information octet is used in the description of the 8b/10b
transmission code-groups, where A is the LSB. Each valid code group has been given a name using the
following convention: /Dx.y/ for the 256 valid data code-groups and /Kx.y/ for the special control code-groups,
where y is the decimal value of bits EDCBA and x is the decimal value of bits HGF (noted as K<HGF.EDCBA>).
Thus, an octet value of FE representing a code-group value of K30.7 would be represented in bit notation as 111
11110.
Figure 10. High-Speed I/O Directly-Coupled Mode
Figure 11. High-Speed I/O AC-Coupled Mode
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