参数资料
| 型号： | IPR-ED8B10B |
| 厂商： | Altera |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | IP 8B10B ENCODER/DECODER RENEW |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | 编码器/解码器，8b/10b 用于千兆位以太网和光纤通道 |
| 许可证： | 续用许可证 |
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. ED8B10B Encoder
clk
kerr
reset_n
kin
enable
idle_ins
datain [7:0]
rdin
dataout [9:0]
valid
rdout
rdcascade
rdforce
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.
4
Altera Corporation
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