AD9644_17 datasheet(41/45 Pages) AD

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AD9644

Data Sheet

Rev. C | Page 40 of 44

JESD204A Device Identification Number (DID)

(Register 0x64)

Bits[7:0]—Serial Device Identification (DID) Number

JESD204A Bank Identification Number (BID)

(Register 0x65)

Bits[7:4]—Open

Bits[3:0]—Serial Bank Identification (DID) Number

JESD204A Lane Identification Number (LID) for Lane 0

(Register 0x66)

Bits[7:5]—Open

Bits[4:0]—Serial Lane Identification (LID) Number for

Lane 0.

JESD204A Lane Identification Number (LID) for Lane 1

(Register 0x67)

Bits[7:5]—Open

Bits[4:0]—Serial Lane Identification (LID) Number for

Lane 1.

JESD204A Scrambler (SCR) and Lane Configuration

Registers (Register 0x6E)

Bit 7—Enable Serial Scrambler Mode

Setting this bit high enables the scrambler (SCR = 1).

Bits[6:1]—Open

Bit[0]—Serial Lane Control.

00000: one lane per link (L = 1).

00001: two lanes per link (L = 2).

00010: 11111—reserved.

JESD204A Number of Octets Per Frame (F)

(Register 0x6F—Read Only)

Bits[7:0]—Number of Octets per Frame (F)

The readback from this register is calculated from the following

equation: F = (M × 2)/L

Valid values for F for the AD9644 are:

F = 2, with M = 1 and L = 1

F = 4, with M = 2 and L = 1

F = 2, with M = 2 and L = 2

JESD204A Number of Frames Per Multiframe

(Register 0x70)

Bits[7:5]—Reserved

Bits[4:0]—Number of Frames per Multiframe (K).

JESD204A Number of Converters Per Link (M)

(Register 0x71)

Bits[7:1]—Reserved

Bit 0—Number of Converters per Link per Device (M).

0: link connected to one ADC. Only primary input used (M = 1).

1: link connected to two ADCs. Primary and secondary inputs

used (M = 2).

JESD204A ADC Resolution (N) and Control Bits Per

Sample (CS) (Register 0x72)

Bits[7:6]—Number of Control Bits per Sample (CS)

00: no control bits sent per sample (CS = 0).

01: one control bits sent per sample—overrange bit enabled.

(CS = 1).

10: two control bits sent per sample—overflow/underflow bits

enabled (CS = 2).

11: unused.

Bit 5—Open

Bits[4:0]—Converter Resolution (N)

Read only bits showing the converter resolution (reads back 13

(0xD) for 14-bit resolution).

JESD204A Total Bits Per Sample (N’) (Register 0x73)

Bits[7:5]—Open

Bits[4:0]—Total Number of Bits per Sample (N’)

Read only bits showing the total number of bits per sample—1

(reads back 15 (0xF) for 16 bits per sample).

JESD204A Samples Per Converter (S) Frame Cycle

(Register 0x74)

Bits[7:5]—Open

Bits[4:0]—Samples per Converter Frame Cycle (S)

Read only bits showing the number of samples per converter

frame cycle −1 (reads back 0 (0x0) for 1 sample per converter

frame).

JESD204A HD and CF Configuration (Register 0x75)

Bit 7—Enable High Density Format (Read Only)

Read only bit—always 0 in the AD9644.

Bits[6:5]—Reserved

Bits[4:0]—Number of Control Words per Frame Clock

Cycle per Link (CF)

Read only bits—reads back 0x0 for the AD9644.

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