Chapter 2: Digital Design Considerations; Figure 2-8: Block Format Function - Xilinx RocketIO X User Manual

R
Table 2-11: Transmit 64B/66B Encoder Control Mapping
Each "one" in the TXC span represents a control-character-match -- recognition that the
associated byte is a special control character of some type (idle, start, terminate, or ordered-
set).
Normal Operation
The 64B/66B encoder implements the Encoding Block Format function shown in
Figure
Input Data
Bit Position
Data Block Format
D D D D D
0 1 2 3 4
Control Block Formats
C C C C C
0 1 2 3 4
C C C C O
0 1 2 3 4
C C C C S
0 1 2 3 4
O D D D S
0 1 2 3 4
O D D D O
0 1 2 3 4
S D D D D
0 1 2 3 4
O D D D C
0 1 2 3 4
T C C C C
0 1 2 3 4
D T C C C
0 1 2 3 4
D D T C C
0 1 2 3 4
D D D T C
0 1 2 3 4
D D D D T
0 1 2 3 4
D D D D D
0 1 2 3 4
D D D D D
0 1 2 3 4
D D D D D
0 1 2 3 4
58
TXC[3:0] (TXCHARISK[3:0])
1000
0000
2-9.
S
Block Payload
y
n
c
01 2
D D D
01 D D
5 6 7
0 1
Block Type
Field
C C C 10 C
0x1e
5 6 7 0
D D D 10 C
0x2d
5 6 7 0
D D D 10 C
0x33
5 6 7 0
D D D 10 D
0x66
5 6 7 1
D D D 10 D
0x55
5 6 7 1
D D D 10 D
0x78
5 6 7 1
C C C 10 D
0x4b
5 6 7 1
C C C 10
0x87
5 6 7
C C C 10 D
0x99
5 6 7 0
C C C 10 D
0xaa
5 6 7 0
C C C 10 D
0xb4
5 6 7 0
C C C 10 D
0xcc
5 6 7 0
T C C 10 D
0xd2
5 6 7 0
D T C 10 D
0xe1
5 6 7 0
D D T 10 D
0xff
5 6 7 0

Figure 2-8: Block Format Function

1-800-255-7778

Chapter 2: Digital Design Considerations

Terminate in fourth position
Data OR error (no k-chars)
D D D
2 3
C C C
1 2 3
C C C
1 2 3
C C C
1 2 3
D D O
2 3 0
D D O
2 3 0
D D D
2 3
D D O
2 3 0
C C C
1 2 3
C C
2 3
D C
1 3
D D
1 2
D D D
1 2
D D D
1 2
D D D
1 2
D D D
1 2
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Block Formatting
D D
4 5 6
C C C
4 5 6
O D D
4 5 6
D D
5 6
D D
5 6
O D D
4 5 6
D D
4 5 6
C C C
4 5 6
C C C
4 5 6
C C C
4 5 6
C C C
4 5 6
C C C
4 5 6
C C
3 5 6
D C
3 4 6
D D
3 4 5
D D
3 4 5
UG035_ch3_23_091103
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
65
D
7
C
7
D
7
D
7
D
7
D
7
D
7
C
7
C
7
C
7
C
7
C
7
C
7
C
7
C
7
D
6