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8b10b Encoder/Decoder MegaCore Function (ED8B10B) Data Sheet
Cascaded Encoding
Two encoders can be cascaded to allow for 16-bit word encoding. The
encoders are cascaded by connecting the rdcascade output of the most
significant byte (MSByte) encoder to the rdin input of the least significant
byte (LSByte) encoder, and by connecting the rdout output of the LSByte
encoder to the rdin input of the MSByte encoder. These connections
ensure proper running disparity computation. The rdforce inputs must
be asserted (active high) for the encoders to take into account the value on
the rdin inputs, rather than use their internally generated running
disparity. Both enable inputs must be high or low at the same time. The
kin [1] signal relates to datain[15:8] , and kin[0] relates to
datain[7:0] . Figure 3 shows two encoders connected together to
perform cascaded encoding.
Figure 3. Cascaded Encoding
clk
Note (1)
reset_n
kerr
kin [1:0]
datain [15:0]
kin [1]
enable
idle_ins
datain [15:8]
rdin
rdforce
clk
reset_n
kin [0]
enable
idle_ins
datain [7:0]
rdin
dataout [9:0]
valid
rdout
rdcascade
kerr
dataout [9:0]
valid
rdout
rdcascade
rdforce
Note:
(1)
The enable , idle_ins , and rdforce signals are set high (logic 1).
Altera Corporation
5
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