PEB20534H-10 SIEMENS [Siemens Semiconductor Group], PEB20534H-10 Datasheet - Page 164
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PEB20534H-10
Manufacturer Part Number
PEB20534H-10
Description
DMA Supported Serial Communication Controller with 4 Channels DSCC4
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.PEB20534H-10.pdf
(442 pages)
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Semiconductor Group
7.8.3
Manchester: In the first half of the bit cell, the physical signal level corresponds to the
logical value of the data bit. At the center of the bit cell this level is inverted. The transmit
clock precedes the receive clock by 90 . The bit cell is shifted by 180 in comparison with
FM coding.
Figure 58
7.9
7.9.1
The SCC provides two pins (RTS, CTS) per serial channel supporting the standard
request-to-send modem handshaking procedure for transmission control.
A transmit request will be indicated by outputting logical ‘0’ on the request-to-send output
(RTS). It is also possible to control the RTS output by software. After having received the
permission to transmit (CTS) the SCC starts data transmission.
HDLC/SDLC and BISYNC: In the case where permission to transmit is withdrawn in the
course of transmission, the frame is aborted and IDLE is sent. After transmission is
enabled again by re-activation of CTS, and if the beginning of the frame is still available
in the SCC, the frame will be re-transmitted (self-recovery). However, if the permission
to transmit is withdrawn after the data available in the shadow part of the SCC transmit
FIFO has been completely transmitted and the pool is released, the transmitter and the
SCC transmit FIFO are reset, the RTS output is deactivated and an interrupt (XMR) is
generated.
Note: For correct identification as to which frame is aborted and thus has to be repeated
Transmit
Clock
Receive
Clock
Manchester
after an XMR interrupt has occurred, the contents of SCC transmit FIFO have to
be unique, i.e. SCC transmit FIFO as well as central transmit FIFO should not
contain data of more than one frame, which could happen if transmission of a new
Manchester Encoding
Modem Control Signals (RTS, CTS, CD)
RTS/CTS Handshaking
Manchester Data Encoding
1
1
Serial Communication Controller (SCC) Cores
0
164
0
1
0 ITD01810
Data Sheet 09.98
PEB 20534
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