WM0011 datasheet(33/233 Pages) CIRRUS

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WM0011

Production Data

PD, Rev 4.1, August 2013

CODE PACKET FORMAT

The Code Packet Format comprises 4 data blocks, as described in Table 10.

NAME

SIZE

DESCRIPTION

CMD

1 byte

Command field, describing the function of the packet

LEN

3 bytes

Length (in bytes) of the DAT portion of this code packet

ADDR

4 bytes

Memory Address associated with the packet

DAT

0 to 8184 bytes

Data words

Table 10 Code Packet Format

The total size of the Code Packet (LEN) is required to be a multiple of 8 bytes.

The ADDR field must also be 64-bit aligned (ie. a multiple of 8 bytes).

All multi-byte data fields in the packet must the formatted in ‘little endian’ (Least Significant Byte first)

format.

One or more code packets may be downloaded to the WM0011 in order to configure the device for

the required application. The Code Packet Format is illustrated in Figure 11.

Figure 11 Code Packet Format

CODE HEADER DOWNLOAD

The Software Code download operation requires multiple Code Packets to be sent to the WM0011.

The download may be achieved via the SPI Slave or SPI Master (eg. Flash Memory) interfaces. If the

Custom fuses are not programmed, then only the SPI (Slave) download method is possible.

The Software Code download comprises one Code Header packet, followed by multiple Code Data

packets.

The Code Packet definition for the Code Header is:



CMD = 0x02



LEN = 0x00_0108



ADDR = Start Address for code execution



DAT = Data words

In the DAT portion of the code packet, the first 32-bit data word will contain the total length (in bytes)

of the code image. This is followed by a 32-bit filler word, followed by the 256-byte image signature

(SHA-256).

For custom-programmed devices, the WM0011 supports PKA-encryption of the image signature. This

is not supported on un-programmed devices.

On receipt of a valid Code Header packet, the WM0011 will expect to receive the associated Code

Data packets, thus completing the software code download.

Boot status and error codes are reported via the UART interface, and via the SPI interface during the

Code Header download - see “Boot Status and Error Reporting”.

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