Comparison of Different Encoding Techniques in 10SPE: Manchester, DCA, and Biphase, Study notes of Technology

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10SPE

Encoding

Comparison

Microchip Technology Inc. November

Outline



Biphase encoding



Manchester

encoding



Differential

Manchester

encoding



4b5b

and

8b10b

encoding



DCA

encoding



Comparison

of

NRZ,

ME,

DME,

DCA,

8B10B,

4b5b+MLT3,

4b5b+ME,

4b5b+DMC,

DCA

DCA

Encoding



DCA

Coding

 Phase encoding  Minimum pulse = source data period  Min pulse is 1 bit, max pulse is 2.5bits , max rising(falling)edge separation is

bits 

DC

balance  Support identifier  Mult

bits needed for encode/decode: bitn, bitn+1, and DSVn

 Encoded data rate is the same as source data rate

10SPE

Coding

Compare

Items Coding Schemem Diff or Manchester DCA 4b5b/8b10b Data rate/Mbps 10 Minimum Pulse/UI @ 10MHz

1

DC balance Y Latency 1 bit 5bit 4/ bit encoder/decoder complexity Low Med High High CDR Complexity Very Low Med High Need train N Y Y Support Identifier (Control code/K code) N Y Y

Spectrum

(no

Filter)

Spectrum

(no

Filter)

Spectrum

(no

Filter)

Eyes

with

st

order

LP

filter

dB Baud rate

LP

corners)

Spectrum

with

st

order

LP

filter

dB Baud rate

LP

corners)

Spectrum

with

st

order

LP

filter

dB Baud rate

LP

corners)

Spectrum

with

rd

order

IIR

LP

filter

dB Baud rate

LP

corners)

Spectrum

with

rd

order

IIR

LP

filter

dB Baud rate

LP

corners)

Eyes

with

st

order

LP/HP

filter

dB 100kHz

HP

Baud rate

LP

corners)

Eyes

with

st

order

LP/HP

filter

dB 100k

HP

Baud rate

LP

corners)