DSD1796DBRG4 datasheet(46/61 Pages) TI1

46 / 61 page

DSD1796

SLES101A – DECEMBER 2003 – REVISED NOVEMBER 2006

www.ti.com

LRCK

BCK

CMD

Don’t

Care

Ch1

CMD

Ch2

Ch3

Ch1

Ch4

IN and OUT Channel Orders are Completely Independent

7 Packets

× 32 Bits

Ch5

Ch6

1/fS (256 BCK Clocks)

Ch2

Figure 54. TDMCA Frame Example of 6-Ch DAC and 2-Ch ADC With Command Read

Command Field

The normal command field is defined as follows. When the DID bit (MSB) is 1, this frame is used only for device ID

determination, and all remaining bits in the field are ignored.

Command

DID

EMD

DCS

Device ID

R/W

Data

Not Used

Bit 31: Device ID enable flag

The DSD1796 operates to get its own device ID for TDMCA initialization if this bit is HIGH.

Bit 30: Extended command enable flag

EMD packet is transferred if this bit is HIGH, otherwise skipped. Once this bit is HIGH, this frame does not contain any audio

data. This is for system initialization.

Bit 29: Daisy chain selection flag

HIGH designates OUT-chain devices, LOW designates IN-chain devices. The DSD1796 is an IN device, so the DCS bit

must be set to LOW.

Bits[28:24]: Device ID.

The device ID is 5 bits length, and it can be defined.These bits identify the order of a device in the IN or OUT daisy chain.

The top of the daisy chain defines device ID 1 and successive devices are numbered 2, 3, 4, etc. All devices for which the

DCI is fixed HIGH are also defined as ID 1. The maximum device ID is 30 each in the IN and OUT chains. If a device ID

of 0x1F is used, all devices are selected as broadcast when in the write mode. If a device ID of 0x00 is used, no device

is selected.

Bit 23: Command Read/Write flag

If this bit is HIGH, the command is a read operation.

Bits[22:16]: Register ID

It is 7 bits in length.

Bits[15:8]: Command data

It is 8 bits in length. Any valid data can be chosen for each register.

Bits[7:0]: Not used

These bits are never transported when a read operation is performed.

Extended command field

The extended command field is the same as the command field, except that it does not have a DID flag.

Extended Command

Rsvd

EMD

DCS

Device ID

R/W

Data

Not Used

DSD1796DBRG4 データシート(PDF) 46 Page - Texas Instruments

DSD1796DBRG4 データシート(HTML) 46 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

データシートダウンロード