TLK3118 Datasheet, PDF (15/57 Pages) Texas Instruments – Redundant XAUI Transceiver

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TLK3118
Redundant XAUI Transceiver
SLLS628A – DECEMBER 2004 – REVISED APRIL 2005
Packet
IPG
TXD[7:0] I I S D D D D ... D D D D I I I I I I
Input
TXD[15:8] I I D D D D D ... D D D T I I I I I I
TXD[23:16] I I D D D D D ... D D D I I I I I I I
TXD[31:24] I I D D D D D ... D D D I I I I I I I
TDP/N0 K R S D D D D ... D D D D A R R K K R
Output
TDP/N1 K R D D D D D ... D D D T A R R K K R
TDP/N2 K R D D D D D ... D D D K A R R K K R
TDP/N3 K R D D D D D ... D D D K A R R K K R
S = Start of Packet, D = Data, T = End of Packet, A = K28.3, K = K28.5, R = K28.0, I = Idle
Figure 13. Inter-Packet Gap Management
The subsequent idles in the IPG will be replaced by “columns” of channel alignment codes (K28.3), byte
alignment codes (K28.5), or clock tolerance compensation codes (K28.0). The state machine which governs the
IPG replacement procedure is illustrated in Figure 14, with notation defined in Table 2. Note that any IPG
management state will transition to send data if the IPG is terminated.
The repetition of the “/A/” pattern on each serial channel allows the FIFO’s to remove or add the required phase
and frequency difference to align the data from all four serial links of a XAUI channel and allow output of the
aligned 32 bit wide data on a single edge of the receive clock, RCLK, as shown in Figure 15.
15