Texas Instruments TLV320AIC12KEVMB-K appendix Data Packet Configuration

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The data packet consists of the following bytes, shown in Table 8:

Table 8. Data Packet Configuration

BYTE NUMBER	TYPE	DESCRIPTION
		Specifies serial interface and operation. The two values are logically OR'd.
		Operation:
		READ	0x00
		WRITE	0x10
0	Interface	Interface:
		GPIO	0x08
		SPI_16	0x04
		I2C_FAST	0x02
		I2C_STD	0x01
		SPI_8	0x00
1	I2C Slave Address	Slave address of I2C device or MSB of 16-bit reg addr for SPI
2	Length	Length of data to write/read (number of bytes)
3	Register address	Address of register for I2C or 8-bit SPI; LSB of 16-bit address for SPI
		Up to 60 data bytes could be written at a time. EP0 maximum length is 64. The
4..64	Data	return packet is limited to 42 bytes, so advise only sending 32 bytes at any one
		time.

Example usage:

Write two bytes (45, A0) to device starting at register 1 of an I2C device with address 80:

[0]0x11

[1]0x80

[2]0x02

[3]0x01

[4]0x45

[5]0xA0

Do the same with a fast mode I2C device:

[0]0x12

[1]0x80

[2]0x02

[3]0x01

[4]0x45

[5]0xA0

In each case, the TAS1020 will return, in an HID interrupt packet, the following:

[0]interface byte status

status:

REQ_ERROR 0x80 INTF_ERROR 0x40 REQ_DONE 0x20

[1]for I2C interfaces, the I2C address as sent

for SPI interfaces, the read back data from SPI line for transmission of the corresponding byte

[2]length as sent

[3]for I2C interfaces, the reg address as sent

for SPI interfaces, the read back data from SPI line for transmission of the corresponding byte

[4..60] echo of data packet sent

SLAU229B–October 2007–Revised August 2008 TLV320AIC12KEVMB-K and TLV320AIC14KEVMB-K User's Guide 23

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