GS2985 datasheet(36/45 Pages) SEMTECH

36 / 45 page

GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

36 of 45

Proprietary & Confidential

4.15.14 Host Register Map

Table 4-12: Host Register Map

Name

Address

Bit

Position

Access

Function

Default

Value

Valid

Range

Comments

EQ_1

0x00

15:10

Reserved.

Input Attenuation Enable

(ATTEN_EN)

0x0

0 or 1

Enable for input

signals above

1Vpp differential

Equalizer Offset Correction Enable

0x1

0 or 1

Recommend

always on

Equalizer Gain Setting for DDI3

0x0

0 or 1

See

supplementary

table below

Equalizer Gain Setting for DDI2

0x0

0 or 1

See

supplementary

table below

Equalizer Gain Setting for DDI1

0x00

0 or 1

See

supplementary

table below

Equalizer Gain Setting for DDI0

0x00

0 or 1

See

supplementary

table below

Equalizer Enable for DDI3

0x00

0 or 1

See

supplementary

table below

Equalizer Enable for DDI2

0x00

0 or 1

See

supplementary

table below

Equalizer Enable for DDI1

0x00

0 or 1

See

supplementary

table below

Equalizer Enable for DDI0

0x00

0 or 1

See

supplementary

table below

Equalizer Decode Logic

EQ_EN

EQ_GAIN

EQ Setting

Recommended Trace Lengths

LOW

0 to 10 inches of FR4

LOW

0 to 10 inches of FR4

MED

10 to 20 inches of FR4

HIGH

20 or more inches of FR4

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