TLK2208B Datasheet, PDF (20/40 Pages) Texas Instruments – 8-PORT GIGABIT ETHERNET TRANCSEIVER

TLK2208B
8ĆPORT GIGABIT ETHERNET TRANSCEIVER
SLLS578D − AUGUST 2003 − REVISED SEPTEMBER 2006
transmit logic (continued)
transmit parallel interface
The TLK2208B provides source-centered interface to the MAC.
In multiplexed channel mode, channels A and B, C and D, E and F, and G and H are each interleaved on the
same 10-bit bus. Channels B, D, F, H are input referenced to the rising edge of TCLKx. Channels A, C, E, and
G are input referenced to the falling edge of TCLKB (see Figure 4).
TCLKx
Source Centered
TDxx[9:0]
CH[G,E,C,A]
CH[H,F,D,B]
Figure 4. Multiplexed Channel Transmit Timing Options
In the nibble interface mode, channels B, D, F, and H are input on high-order nibble TDxx[9:5], while channels
A, C, E, G are input on low-order nibble TDxx[4:0], as shown in Figure 5. Note: In the transmit direction, channel
pairs (A/B, C/D, E/F, G/H) have a common transmit clock and DDR input register bank. As a result, software
assertion of the Channel A TX_SwRST MDIO register will temporarily corrupt Channel B data (until the software
reset ends). Channel C TX_SwRST causes the same data corruption on Channel D. Channel E TX_SwRST
causes the same data corruption on Channel F. Channel G TX_SwRST causes the same data corruption
on Channel H.
TCLKx
Source Centered
TDxx[4:0]
CH[A,C,E,G]
Least-Significant
Nibble
CH[A,C,E,G]
Most-Significant
Nibble
TDxx[9:5]
CH[B,D,F,H]
Least-Significant
Nibble
CH[B,D,F,H]
Most-Significant
Nibble
Figure 5. Nibble Mode Transmit Timing Options
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