8B10B datasheet(39/40 Pages) ALTERA

39 / 40 page

Altera Corporation

MegaCore Version 7.2

3–11

October 2007

8B10B Encoder/Decoder MegaCore Function User Guide

Specifications

idle_ins

Input

Idle character insert. When high, idle (K28.5) characters are inserted

when ena is not asserted.

datain[7:0]

Input

Data input. This is the 8-bit input word, data or command.

rdin

Input

Running disparity input. When rdforce is high, the value on this pin is

used as the current running disparity instead of the internally generated

one.

rdforce

Input

Force running disparity. When high, the rdin value overrides the

internally generated running disparity.

kerr

Output

Special K character error. This signal is set high when ena and kin are

high and the value on datain is not a valid special K character.

dataout[9:0]

Output

Data output. This is the 10-bit encoded output.

valid

Output

Valid signal. When high, indicates that a valid encoded word is present

on the dataout output.

rdout

Output

Running disparity output. The current running disparity (after encoding

the word present on the dataout output).

rdcascade

Output

Cascaded running disparity. Used when encoders are cascaded.

Table 3–4. Decoder Signals (Part 1 of 2)

Signal Name

Direction

Description

clk

Input

Clock. The input is latched, and the result output on this clock. There is

a three clock cycle latency between the input and output.

reset_n

Input

Active low, reset. Asynchronously resets all registers in the MegaCore

function. This signal must be deasserted synchronously to the rising

edge of clk.

idle_del

Input

Idle delete signal. When high, idle words (K28.5) are removed from the

stream (i.e. valid is set low when idle words are received).

ena

Input

Enable decoder signal. When high, indicates that the data currently

present on the datain input is to be decoded.

datain[9:0]

Input

Data input. This is the 10-bit encoded input word.

rdin

Input

Running disparity input. When rdforce is high, the value on this pin is

used as the current running disparity instead of the internally generated

one.

rdforce

Input

Force running disparity. When high, the rdin value overrides the

internally generated running disparity.

Table 3–3. Encoder Signals (Part 2 of 2)

Signal Name

Direction

Description

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