SERCON410B Datasheet, PDF (28/34 Pages) STMicroelectronics – SERCOS INTERFACE CONTROLLER

SERCON410B
DATA STRUCTURES WITHIN THE RAM (Continued)
A telegram header for transmit telegram comprises four control words:
Index
0
1
2
3
Bit
0-7
8
9
10
11-12
13
14
15
0-15
0-15
0-9
10-15
Name
ADR
DMA
DBUF
VAL
EN
1
0
TRT
TLEN
PT
Function
Telegram address
Data storage in the RAM (DMA = 0) or DMA transfer (DMA = 1).
Data in RAM: single buffer (DBUF = 0) or double buffer (DBUF = 1).
For double buffering (DMA = 0, DBUF = 1): data in buffer 0 (VAL = 0)
or buffer 1 (VAL = 1) are valid. Set by processor.
Data telegram is not to be transmitted (EN = 0), transmitted once
(EN = 1), continuously (EN = 2) or transmitted only if the previously
received telegram contains the expected address (EN = 3) (PHAS12
=1 and FLMDTADR = 1). If EN is 1 the circuit sets EN to 0 after
the transmit telegram has been started.
(Not used)
Marker bit for telegram header of transmit telegram.
Marker bit for telegram header.
Time for the start of telegram in •s after the end of MST.
Length of the telegram in data words (not including address).
Word address of the next telegram header or the end marker.
(Not used)
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