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參數(shù)資料
| 型號： | DSD1608PAHR |
| 英文描述： | 8-CHANNEL, ENHANCED MULTIFORMAT, DELTA-SIGMA, DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 8通道，增強多格式，Δ-Σ，數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 34/41頁 |
| 文件大小： | 293K |
| 代理商： | DSD1608PAHR |
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DSD1608
SLES040
–
JUNE 2002
www.ti.com
34
Command Field
The command field is defined as follows. The DID field (MSB) has another meaning, that this frame is for device ID
determination.
31
30
29
28
24
23
22
21
20
16
15
8
7
0
command
DID
EMD
DCS
Device ID
R/W
Register ID
Data
Not used
Bit 31: Device ID Enable Flag
The DSD1608 operates to get its own device ID if this bit is HIGH. This is for TDMCA initialization.
Bit 30: Extended Command Enable Flag
An EMD packet is transferred if this bit is HIGH, otherwise skipped. When the bit is HIGH, this frame does not contain
any audio data. This is for system initialization.
Bit 29: Daisy Chain Selection Flag
HIGH means OUT chain devices, LOW means IN chain devices. The DSD1608 is an IN device, so the DCS bit must
be set to LOW.
Bit [28:24]: Device ID
The device ID is 5 bits in length, and it can be defined. IDs of devices follow the order of an IN or OUT daisy chain.
The top device of the daisy chain has device ID 1 and the next device in the chain has device ID 2, etc. The ID for
any device that has its DCI set HIGH is also 1. The maximum device ID each in the IN or OUT chain is 30. If a device
ID is 0x1F, all devices are selected as broadcast when in the write mode. If any device ID is 0x00, no device is
selected.
Bit 23: Command Read/Write Flag
If it is HIGH, the command is a read operation.
Bit [22:16]: Register ID
The register ID is 7 bits in length. See Table 3.
Bit [15:18]: Command Data
The command data is 8 bits in length. Any valid data can be chosen for each register. See Table 3.
Bit [7:0]: Not used
These bits are never transported when a read operation is performed.
Extended Command Field
The extended command field is almost the same as the command field. The only difference is that it does not have
a DID flag.
31
30
29
28
24
23
22
21
20
16
15
8
7
0
Extended command
RSVD
EMD
DCS
Device ID
R/W
Register ID
Data
Not Used
Audio Field
The audio field is 32 bits in length and the audio data is transferred MSB first. When transferring audio data of less
than 32 bits, the unused portion of the field must be padded with 0s, as the following figure shows.
31
16
12
8
7
0
Audio data
MSB
24 bits
LSB
All 0s
MSB
20 bits
LSB
All 0s
MSB
16 bits
LSB
All 0s
TDMCA Register Requirements
The TDMCA mode requires device ID and audio channel information, previously described. Register 9 indicates the
audio channels and register 17 indicates the device ID. Register 17 is used only in the TDMCA mode. See the
Mode
Control Register Map
, Table 3
.
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