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8b10b Encoder/Decoder MegaCore Function (ED8B10B) Data Sheet
Figure 4. Encoder Timing Diagram
n
n+1
n+2
n+3
clk
datain,
kin,
a
b
c
d
e
f
g
enable
a
b
c
d
dataout
rdforce,
a
b
c
d
e
rdin
Decoder
Data and identified 10-bit special K codes are converted from 10 bits to 8
bits; see Table 1 on page 3 for a list of the valid K codes, and Figure 1 on
page 2 for an illustration of the conversion process.
When special 10-bit K codes are received, the special K codes are
translated to 8-bit values, and the kout signal is asserted. The decoder
also checks for invalid 10-bit codes, and asserts the kerr signal when
invalid codes are detected.
When the idle_del signal is asserted, it deletes all 10-bit words
identified as the special IDLE character of K28.5.
When the receiver detects a disparity error, the rderr signal is asserted.
Figure 5 shows a block diagram of the decoder.
Figure 5. ED8B10B Decoder
Altera Corporation
clk
reset_n
idle_del
enable
datain [9:0]
rdin
rdforce
valid
dataout [7:0]
kout
kerr
rderr
rdout
rdcascade
7
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