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參數(shù)資料
| 型號： | IP-ED8B10B |
| 元件分類： | 通信、網(wǎng)絡(luò)模塊及開發(fā)工具 |
| 英文描述： | Telecomm/Datacomm |
| 中文描述： | 電信/數(shù)據(jù)通信 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 502K |
| 代理商： | IP-ED8B10B |
4
Altera Corporation
8b10b Encoder/Decoder MegaCore Function (ED8B10B) Data Sheet
Encoder
The encoder uses an innovative, proprietary, non-partitioned, memory-
based LUT implementation to convert data and identified special 8-bit
codes from 8 bits to 10 bits. See
Figure 1 on page 2
for an illustration of the
conversion process.
To encode an 8-bit word, the 8-bit value must be applied to the
datain
inputs and the
enable
input must be asserted (active high).
When one of the twelve special 10-bit codes is to be inserted, the
equivalent 8-bit code is placed on the
datain
lines and the
kin
input is
asserted. The core performs error checking to ensure the out-of-band 8-bit
code is valid. If not, the
kerr
output is asserted. See
Table 1 on page 3
for
a list of the valid
K
codes.
Idle (K28.5) characters can be automatically inserted when
enable
is not
asserted by asserting the
idle_ins
input.
Figure 2
shows a block diagram of the encoder.
Figure 2. ED8B10B Encoder
Disparity
The running disparity can be forced to positive or negative, allowing the
user to insert a special resynchronization pattern, or disparity errors.
When the
rdforce
input is asserted, the value on the
rdin
port is
assumed to be the current running disparity. Setting
rdin
to 0 forces the
encoder to produce an encoded word with positive or neutral disparity.
Setting
rdin
to 1 forces the encoder to produce an encoded word with
negative or neutral disparity.
clk
reset_n
kin
enable
rdin
rdcascade
rdout
valid
kerr
datain [7:0]
dataout [9:0]
rdforce
idle_ins
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