AD9173 datasheet(69/144 Pages) AD

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Data Sheet

AD9173

START-UP SEQUENCE

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Rev. C | 69 of 144

Table 53. JESD204B Mode Setup

R/W

Bits

Value

Description

0b1 = dual-link mode.

0b0

Select Link 0 for setup. This bit selects the link QBD being paged.

0b0 = Link 0 (QBD0).

0b1 = Link 1 (QBD1).

[1:0]

0b00

Keep links disabled until end of routine.

0x475

[7:0]

0x09

Soft reset the JESD204B quad-byte deframer.

0x453

SCR

Set scrambling option for SERDES data.

0 = disable scrambling.

1 = enable scrambling.

[4:0]

L−1

Write the L value (in n − 1 notation) for the selected JESD_MODE.

0x458

[7:5]

SUBCLASSV

For Subclass 0, set this bit to 0. For Subclass 1, set this bit to 1.

[4:0]

NP−1

Write the NP value (in n − 1 notation) for the selected JESD_MODE.

0x475

[7:0]

0x01

Bring the JESD204B quad-byte deframer out of reset.

0x300

If running in dual link mode, repeat writes for Link 1 as follows. If running in single-link mode, skip the

remaining steps in this table.

LINK_MODE

Corresponds to the mode selection made in Register 0x110.

0b0 = single-link mode.

0b1 = dual link mode.

0b1

Select Link 1 for setup. This bit selects which link QBD is being paged.

0b0 = Link 0 (QBD0).

0b1 = Link 1 (QBD1).

[1:0]

0b00

Keep links disabled until end of routine.

0x475

[7:0]

0x09

Soft reset the JESD204B quad-byte deframer.

0x453

SCR

Set scrambling option for SERDES data.

0 = disable scrambling.

1 = enable scrambling.

0x458

[4:0]

L−1

Write the L value (in n − 1 notation) for the selected JESD_MODE.

[7:5]

SUBCLASSV

For Subclass 0, set this bit to 0. For Subclass 1, set this bit to 1.

[4:0]

NP−1

Write the NP value (in n − 1 notation) for the selected JESD_MODE.

0x475

[7:0]

0x01

Bring the JESD204B quad-byte deframer out of reset.

Table 54 lists optional registers to configure the channel datapaths if they are being configured for a specific application. If the channel

datapaths are bypassed (CH_INTERP_MODE = 1 for 1× channel interpolation), Table 54 can be skipped in the start-up sequence.

Table 54. Channel Datapath Setup: Digital Gain and Channel NCOs

R/W

Bits

Value

Description

0x008

[5:0]

CHANNEL_PAGE. Select the channels to be programmed at the same time (or repeat this block for each channel to

independently program values). Bit x of this control corresponds to the Channel x datapath.

0x146

[7:0]

CHNL_GAIN[7:0]. Write LSBs of channel digital gain. Configure digital gain for selected channels in Paging Register 0x008.

Calculation: CHNL_GAIN = 211 × 10(dBGain/20) where dBGain is the gain value in dB for the channel gain desired.

0x147

[7:0]

CHNL_GAIN[11:8]. Write MSBs of channel digital gain. Calculations shown in Register 0x146.

0x130

Enable NCO for selected channels in paging Register 0x008.

0b0 = disable NCO.

0b1 = enable NCO.

Enable NCO modulus for selected channels in paging Register 0x008.

0b0 = disable NCO modulus.

0b1 = enable NCO modulus.

Select sideband from modulation result.

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