TLK2226_09 Datasheet, PDF (24/52 Pages) Texas Instruments – 6 PORT GIGABIT ETHERNET TRANSCEIVER

TLK2226
SLLS689D – JANUARY 2006 – REVISED DECEMBER 2006
www.ti.com
Framing (Encapsulation)
Upon the assertion of TX_EN, TLK2226 encapsulates data asserted by the MAC on the parallel interface (TDx)
into a code_group stream according to IEEE 802.3z clause 36.
Upon the receipt of a valid code_group stream at the serial RX interface, TLK2226 decodes the incoming data,
extracts packets and passes the decoded data to the MAC via the parallel RDx interface according to IEEE
802.3z clause 36.
The 5-bit parallel interfaces of TLK2226 (RX and TX) are compliant to the RGMII specification version 2.0 from
04/01/2002.
CODE needs to be asserted a logic HIGH to perform framing.
PHYSICAL CODING SUBLAYER (PCS) FUNCTIONS (125 Mbps MODE)
4b/5b Encoder/Decoder
The TLK2226 shall implement the 4b/5b encoder and decoder functions according to IEEE802.3 Clause 24
when in 100FX mode instead of the 8b/10b coding functions.
NRZI Encoder/Decocer
The TLK2226 shall implement the cipher scrambling and descrambling functions according to ISO/IEC
9314-3:1990.
Nibble Alignment
The TLK2226 will align the first properly NRZI decoded /I/J/K/ pattern.
PER CHANNEL RATE DETECTION DETERMINATION
The actual rate per channel is determined by Table 4.
Table 4. Per Channel Rate Determination
0.12
Auto Negotiation
Enable
1
1
0
0
0
X
X
X
16.5
Rate Sense
Enable
1
0
1
0
0
X
X
X
0.6
Speed Selection
(MSB)
X
X
X
1
0
1
0
0
0.13
Speed Selection
(LSB)
X
X
X
0
1
0
1
0
16.4
SGMII Mode
Enable
0
0
0
0
0
1
1
1
TLK2226 Behavior
Auto Rate Sense (Default Behavior)
1000Base-X Rate
Auto Rate Sense
1000Base-X Rate
100Base-FX Rate
SGMII (1000 Mbps Data path Operation)
SGMII (100 Mbps Data path Operation)
SGMII (10 Mbps Data path Operation)
The resulting value of the per channel rate may be read in read only register bit 28.14. This bit indicates the
actual serial rate of a channel as a function of the above bits shown in Table 4.
CONTROL LOGIC
MDIO Management Interface
The TLK2226 supports the Management Data Input/Output (MDIO) Interface as defined in Clause 22 of the
IEEE 802.3 Ethernet specification. The MDIO allows register-based management and control of the serial links.
Normal operation of the TLK2226 is possible without use of this interface since all of the essential signals
necessary for operations are accessible via the device pins. However, some additional features are accessible
only through the MDIO. The PHY address contained in the MDIO protocol allows to individually access/address
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