Inter-Packet Gap Management - Texas Instruments TLK3134 Data Manual

TLK3134
SLLS838F – MAY 2007 – REVISED DECEMBER 2009
TXD(7:0)
TXD(15:8)
Input
TXD(23:16)
TXD(31:24)
TDP/N0
TDP/N1
Output
TDP/N2
TDP/N3
S = Start of Packet, D = Data, T = End of Packet,
A = K28.3, K = K28.5, R = K28.0, I = Idle
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
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 FIFOs 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 2-25.
42 Detailed Description
Packet
I I S D D D D
I I D D D D D
I I D D D D D
I I D D D D D
K R S D D D D
K R D D D D D
K R D D D D D
K R D D D D D
Figure 2-26. Inter-Packet Gap Management
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... D D D D I
... D D D T I
... D D D I I
... D D D I I
... D D D D A R
... D D D T A R
... D D D K A R
... D D D K A R
Figure 2-27, with notation defined in
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TLK3134
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IPG
I I I I I
I I I I I
I I I I I
I I I I I
R K K R
R K K R
R K K R
R K K R
Table 2-18.