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9.1
Overview
Description
The synchronous interface allows data transmission complying with IEC 61158-2
(voltage mode, 31.25 Kbps). It includes services of the interfaces defined in this
standard between the data link layer and physical layer (FDL-Ph Layer Interface),
the Ph DIS sublayer(DCE Independent Sublayer) and Ph MDS (Medium-
Dependent Sublayer) for wire media and the corresponding MDS-MAU Interface.
The Station Management-Physical Layer Interface (parts of the service
primitives defined optionally in the IEC 61158-2 standard) is also implemented.
What is not implemented is the so-called "Medium Access Unit" (MAU) that
includes the transmit pulse shaper, the line driver, the receive amplifier, the receive
filter, and the line attachment (if necessary with remote powering). The MAU ASIC
SIM1 simplifies the structure of this synchronous interface significantly (refer to the
appendix or the separate description).
Micro-
Sequenzer
Figure 9-1
116
Transmitter
Tx-Register/
Tx-Buffer
Tx-Control/
FCS-
Generator
8
Receiver
Rx-Control/
FCS- Check
Rx-Register/
Rx-Buffer
Block Diagram of the Synchronous Interface
Manchester
Encoder/
Delimiter
Generator
Gap-
Timer
Clock
Recovery
Manchester
Decoder/
Receive
Delimiter
Filter
Detector
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
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