GS2965 datasheet(33/41 Pages) SEMTECH

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GS2965 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

52462 - 4

July 2012

33 of 41

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

8RW

Equalizer Offset Correction Enable

0x1

0 or 1

Recommend

always on

7RW

Equalizer Gain Setting for DDI1

0x0

0 or 1

See

supplementary

table below

6 - 5

Unused

0x0

0 or 1

−

4RW

Equalizer Gain Setting for DDI0

0x00

0 or 1

See

supplementary

table below

3RW

Equalizer Enable for DDI1

0x00

0 or 1

See

supplementary

table below

2 - 1

Unused

0x00

0 or 1

−

0RW

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

DRIVER_1

0x01

15:10

Unused

0x0

0 or 1

−

9RW

Amplitude Control for DDO1

0x1

0 or 1

0 = 800mV swing

1 = 400mV swing

8RW

Amplitude Control for DDO0

0x1

0 or 1

0 = 800mV swing

1 = 400mV swing

7:5

De-Emphasis Boost Amplitude

Control for DDO1

0x2

0x0 to

0x7

0x0 = Lowest

Setting

0x7 = Highest

Setting

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