TV Converter Box User Manual

USB-MODEVM Protocol

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Do the same with a fast mode I

C device:

[0] 0x12

[1] 0xA0

[2] 0x02

[3] 0x05

[4] 0xAA

[5] 0x55

Now with an SPI device which uses an 8-bit register address:

[0] 0x10

[1] 0xA0

[2] 0x02

[3] 0x05

[4] 0xAA

[5] 0x55

Now consider a 16-bit register address, as found on parts like the TSC2101. Assume that the register

address (command word) is 0x10E0:

[0] 0x14

[1] 0x10 --> Note: the I

C address now serves as MSB of reg addr.

[2] 0x02

[3] 0xE0

[4] 0xAA

[5] 0x55

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

[0] interface byte | status

status:

REQ_ERROR 0x80

INTF_ERROR 0x40

REQ_DONE 0x20

[1] for I

C interfaces, the I

C 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 I

C 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

USB-MODEVM Protocol46 SLAU286 – June 2009

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