Datasheet

893
32142D–06/2013
ATUC64/128/256L3/4U
34.6.8 aWire Response Summary
The implemented aWire responses are shown in the table below.
34.6.8.1 ACK
The AW has received the command successfully and performed the operation.
34.6.8.2 NACK
The AW has received the command, but got a CRC mismatch.
34.6.8.3 IDCODE
The JTAG idcode for this device.
34.6.8.4 MEMDATA
The data read from the address specified by the MEMORY_READ command. The last 3 bytes
are status bytes from the read. The first status byte is the status of the command described in
the table below. The last 2 bytes are the number of remaining data bytes to be sent in the data
field of the packet when the error occurred. If the read was not successful all data bytes after the
failure are undefined. A successful word read (4 bytes) will look like this:
Table 34-48. aWire Response Summary
RESPONSE Instruction Description
0x40 ACK Acknowledge.
0x41 NACK Not acknowledge. Sent after CRC errors and after unknown commands.
0xC0 IDCODE The JTAG idcode.
0xC1 MEMDATA Values read from memory.
0xC2 MEMORY_READWRITE_STATUS
Status after a MEMORY_WRITE or a MEMORY_READ command. OK, busy,
error.
0xC3 BAUD_RATE The current baudrate.
0xC4 STATUS_INFO Status information.
0xC5 MEMORY_SPEED SAB to aWire speed information.
Table 34-49. ACK Details
Response Details
Response value 0x40
Additional data N/A
Table 34-50. NACK Details
Response Details
Response value 0x41
Additional data N/A
Table 34-51. IDCODE Details
Response Details
Response value 0xC0
Additional data JTAG idcode