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參數(shù)資料
| 型號： | TAS5508PAGR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 69/105頁 |
| 文件大小： | 1286K |
| 代理商： | TAS5508PAGR |
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5.3
Single-Byte Write
A6
A5
A4
A3
A2
A1
A0
R/W ACK A7
A6
A5
A4
A3
A2
A1
A0
ACK
D7
D6
D5
D4
D3
D2
D1
D0 ACK
Start
Condition
Stop
Condition
Acknowledge
I CDevice Addressand
2
Read/WriteBit
Subaddress
DataByte
T0036-01
5.4
Multiple-Byte Write
D7
D0 ACK
Stop
Condition
Acknowledge
I CDevice Addressand
2
Read/WriteBit
Subaddress
LastDataByte
A6
A5
A1
A0 R/W ACK A7
A5
A1
A0
ACK D7
ACK
Start
Condition
Acknowledge
FirstDataByte
A4
A3
A6
OtherDataBytes
ACK
Acknowledge
D0
D7
D0
T0036-02
TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
www.ti.com
During multiple-byte write operations, the TAS5508 compares the number of bytes transmitted to the
number of bytes that are required for each specific subaddress. If a write command is received for a
biquad subaddress, the TAS5508 expects to receive five 32-bit words. If fewer than five 32-bit data words
have been received when a stop command (or another start command) is received, the data received is
discarded. Similarly, if a write command is received for a mixer coefficient, the TAS5508 expects to
receive one 32-bit word.
Supplying a subaddress for each subaddress transaction is referred to as random I2C addressing. The
TAS5508 also supports sequential I2C addressing. For write transactions, if a subaddress is issued
followed by data for that subaddress and the 15 subaddresses that follow, a sequential I2C write
transaction has taken place, and the data for all 16 subaddresses is successfully received by the
TAS5508. For I2C sequential write transactions, the subaddress then serves as the start address and the
amount of data subsequently transmitted, before a stop or start is transmitted, determines how many
subaddresses are written. As is true for random addressing, sequential addressing requires that a
complete set of data be transmitted. If only a partial set of data is written to the last subaddress, the data
for the last subaddress is discarded. However, all other data written is accepted; only the incomplete data
is discarded.
As shown in Figure 5-2, a single-byte, data-write transfer begins with the master device transmitting a start
condition followed by the I2C device address and the read/write bit. The read/write bit determines the
direction of the data transfer. For a write data transfer, the read/write bit is a 0. After receiving the correct
I2C device address and the read/write bit, the TAS5508 device responds with an acknowledge bit. Next,
the master transmits the address byte or bytes corresponding to the TAS5508 internal memory address
being accessed. After receiving the address byte, the TAS5508 again responds with an acknowledge bit.
Next, the master device transmits the data byte to be written to the memory address being accessed. After
receiving the data byte, the TAS5508 again responds with an acknowledge bit. Finally, the master device
transmits a stop condition to complete the single-byte, data-write transfer.
Figure 5-2. Single-Byte Write Transfer
A multiple-byte, data-write transfer is identical to a single-byte, data-write transfer except that multiple data
bytes are transmitted by the master device to TAS5508, as shown in Figure 5-3. After receiving each data
byte, the TAS5508 responds with an acknowledge bit.
Figure 5-3. Multiple-Byte Write Transfer
66
I2C Serial-Control Interface (Slave Address 0x36)
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