SPI Programming Manual (H06.24+, J06.13+)

SPI Programming Manual—427506-007
C-1
C SPI Internal Structures
This appendix describes these internal formats of SPI data structures:
The detailed formats are expressed as TAL structures. This information is for
debugging purposes only.
SPI Buffer Format
An SPI buffer consists of an SPI message header and zero or more buffer tokens
(tokens that are not header tokens). The header consists of three parts: the standard
part, the specialized part, and the context part.
Each buffer token consists of a token code and a token value, as described in
Section 2, SPI Concepts and Protocol
.
The three parts of the header contain information that includes the values of the
header tokens. Each of the three parts is implemented as a structure, and the values of
the header tokens in that part are fields in the structure. Thus the header tokens are
Topic Page
SPI Buffer Format
C-1
Token Structure C-5
Token-Map Structure C-7
List Structure C-10
Note. The information in this appendix might change in future RVUs. Application programs and
subsystems you write should not depend on these formats. Always work with these structures using their
symbolic names with the SPI procedures.
Figure C-1. SPI Buffer Format
VST023.vsd
Header
Tokens
Context Part
Rest of Buffer
Standard Part
Specialized Part