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USB-MODEVM Protocol

Do the same with a fast mode I2C 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 let's do a 16-bit register address, as found on parts like the TSC2101. Assume the register address

(command word) is 0x10E0:

[0]

0x14

[1]

0x10

--> Note: the I2C address now serves as MSB of reg addr.

[2]

0x02

[3]

0xE0

[4]

0xAA

[5]

0x55

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

USB-MODEVM Protocol

SLAU218 – August 2007

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