ADC14X250 datasheet(37/69 Pages) TI1

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ADC14X250

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8.5.1.12 SER_CFG (Serial Lane Transmitter Configuration), [Address: 0x0047], [Default: 0x00]

Table 18. SER_CFG (Serial Lane Transmitter Configuration), [Address: 0x0047], [Default: 0x00]

Bit

Field

Type

Reset

Description

[7]

Reserved

Read or write

Reserved. Must be written as 0.

[6:4]

VOD[2:0]

Read or write

000

Serial-lane transmitter driver output differential peak-peak-voltage amplitude.

000 : 0.570 V (default)

001 : 0.660 V

010 : 0.750 V

011 : 0.840 V

100 : 0.940 V

101 : 1.02 V

110 : 1.11 V

111 : 1.20 V

Reported voltage values are nominal values at low-lane rates with de-emphasis

disabled

[3]

Reserved

Read or write

Reserved and must be written as 0.

[2:0]

DEM[2:0]

Read or write

000

Serial lane transmitted de-emphasis.

De-emphasis value are for VOD configured to 100.

DEM

De-emphasis [dB]

000

0.0

001

1.4

010

3.4

011

4.9

100

5.9

101

7.4

110

8.9

111

12.1

8.5.1.13 JESD_CTRL1 (JESD Configuration Control 1) , [Address: 0x0060], [Default: 0x7D]

Table 19. JESD_CTRL1 (JESD Configuration Control 1) , [Address: 0x0060], [Default: 0x7D]

Note: Before altering any parameters in this register, one must set JESD_EN = 0. Changing parameters while JESD_EN = 1 is not

supported.

Bit

Field

Type

Reset

Description

[7]

SCR_EN

Read or write

Scrambler enable.

0 : Disabled (default)

1 : Enabled

Note:

•

JESD_EN must be set to 0 before altering this field.

[6:2]

K_M1[4:0]

Read or write

11111

Number of frames per multi-frame, K – 1.

The binary values of K_M1 represent the value (K – 1)

00000 : Reserved

00001 : Reserved

…

00111 : Reserved

01000 : K = 9

…

11111 : K = 32 (default)

Note:

•

K must be in the range 9 to 32. Values outside this range are

either reserved or may produce unexpected results.

•

JESD_EN must be set to 0 before altering this field.

[1]

Reserved

Read or write

Reserved and must be written as 0.

[0]

JESD_EN

Read or write

JESD204B link enable.

When enabled, the JESD204B link synchronizes and transfers data

normally. When the link is disabled, the serial transmitters output a

repeating, alternating 01010101 stream.

0 : Disabled

1 : Enabled (default)

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