Table of Contents
7.6.1
Memory Wastage with 16-Byte Segments
Due to the extra 16-byte segment for the 8-byte long header, each indication block
wastes 8 bytes of memory. At the end of the data, in contrast to 8-byte
segmentation, it can waste a further 8 bytes.
Each Reply-on-Indication block can waste a further 8 bytes at the end.
With an indication queue with space for 2 frames and 20 Reply-On-Indication
blocks, the maximum possible wastage is 2*16 + 20*8 = 192 bytes.
7.6.2
Mem-Overflow Interrupt with 16-Byte Segments
The Mem-Overflow interrupt becomes active with 8-byte segments as soon as
there is an attempt to access beyond the 2-Kbyte boundary.
The Mem-Overflow interrupt becomes active with 16-byte segments as soon as
there is an attempt to access beyond the 3-Kbyte boundary.
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PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
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