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AS8579

Functional Description

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 20

Figure 15:

Read/Write Command

All Write commands are 3 bytes long with the order: command, data high, data low. For these

commands data will always be sent and received in Big Endian format; i.e. most significant byte first.

Incoming data will be padded with zeros to fill the 2 data bytes. The first returned byte will be an echo

of the command. The second and third bytes will return 0x00. Following the third byte, subsequent

clocks will return a ‘0’.

Most Read commands are 3 bytes long with the order: command, data high, data low. When reading I

and Q registers at the same time for a “quick read” 5 bytes are required in this order: command, I data,

I data, Q data, Q data. For all Read commands data will always be sent and received in Big Endian

format; i.e. most significant byte first. The 2 or 4 bytes of data from the host should all be 0x00. The

first returned byte will be an echo of the command. The second through fifth bytes will return the data

in the register(s) being read. Following the third/fifth byte, subsequent clocks will return the last data

bit.

Figure 16:

Quick Read Command

Quick Read I and Q Data Register (0x03 and 0x04):

LSB

MSB

ADDR[23:16]

DATA2[7:0]

LSB

MSB

8 7

DATA1[15:8]

16 15

CMD

DATA2[7:0]

8 7

DATA1[15:8]

16 15

MISO

MOSI

LSB

MSB

LSB

MSB

CMD

IDATA1[31:24]

IDATA2[23:16]

QDATA1[15:8]

QDATA2[7:0]

0x00

0x90

8 7

16 15

24 23

32 31

8 7

16 15

24 23

32 31

MOSI

MISO

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