Texas Instruments 990 User Manual page 251

Communications Structures
The frames containing program data are shown in more detail in
the following diagram:
FLAG ADDR. >13
LOAD WORD LOAD
CRC FLAG
ADDRESS COUNT DATA
(BYTE)
(BYTE) (BYTE) (WORD) (WORD) (WORDS) (WORD) (BYTE)
2280630
The word count is the number of words contained in the data
field~ the load address is the memory starting address for
loading the data at the secondary station. The load data is
binary load data which has already relocated. The data is
relocated by using the preprocessor command PREDB, (see paragraph
5.2.2). The last data frame will have a zero in the word count
field and the load address field will contain the program start
vector. The start vector is given using the assembler
END
<start
vector> statement. If no start vector is supplied by the program
the address frame will contain a zero.
2270526-9701 D-17/D-18