Datasheet

887
32142D–06/2013
ATUC64/128/256L3/4U
34.6.7 aWire Command Summary
The implemented aWire commands are shown in the table below. The responses from the AW
are listed in Section 34.6.8.
All aWire commands are described below, with a summary in table form.
34.6.7.1 AYA
This command asks the AW: “Are you alive”, where the AW should respond with an
acknowledge.
Table 34-31. aWire Command Summary
COMMAND Instruction Description
0x01 AYA “Are you alive”.
0x02 JTAG_ID Asks AW to return the JTAG IDCODE.
0x03 STATUS_REQUEST Request a status message from the AW.
0x04 TUNE Tell the AW to report the current baud rate.
0x05 MEMORY_SPEED_REQUEST
Reports the speed difference between the aWire control and the SAB clock
domains.
0x06 CHIP_ERASE Erases the flash and all volatile memories.
0x07 DISABLE Disables the AW.
0x08 2_PIN_MODE
Enables the DATAOUT pin and puts the aWire in 2-pin mode, where all
responses are sent on the DATAOUT pin.
0x80 MEMORY_WRITE Writes words, halfwords, or bytes to the SAB.
0x81 MEMORY_READ Reads words, halfwords, or bytes from the SAB.
0x82 HALT Issues a halt command to the device.
0x83 RESET Issues a reset to the Reset Controller.
0x84 SET_GUARD_TIME Sets the guard time for the AW.
Table 34-32. Command/Response Description Notation
Command/Response Description
Command/Response value Shows the command/response value to put into the command/response field of the packet.
Additional data Shows the format of the optional data field if applicable.
Possible responses Shows the possible responses for this command.
Table 34-33. AYA Details
Command Details
Command value 0x01
Additional data N/A
Possible responses
0x40: ACK (Section 34.6.8.1)
0x41: NACK (Section 34.6.8.2)