8.3.1
Block Headers in
User Memory
Each block in the memory begins with a header that is five words
long. The block header is divided as follows:
1st word: Block start ID: 7070H
2nd word: High byte = Block type
Low byte = Block number
The low byte of the second header word contains the
block number (0 to 255). It is coded as a hexadecimal
number: 00 to FFH.
3rd word: The high byte of the third word contains the IDs for
the programmer. The low byte contains part of the
library number.
4th word: The fourth word contains the rest of the library number.
5th word: The fifth word (low and high bytes) contains the length of
the block, including the block header. The length is
indicated in words.
01H Data block DB
02H Sequence block SB
Program block PB
Function block FX
Function block FB
Data block DX
Organization block OB
04H
05H
08H
0CH
10H
00
address list in DB 0.
address list in DB 0.
01
The block is invalid; it is not entered in the
The block in the RAM is valid; it is entered in the
Bit no. 15 14 13 12 11 10 9 8
User Memory Organization in the CPU 948
CPU 948 Programming Guide
8 - 12 C79000-G8576-C848-04
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