SERCON410B Datasheet, PDF (21/34 Pages) STMicroelectronics – SERCOS INTERFACE CONTROLLER

SERCON410B
4 CONTROL REGISTERS AND RAM DATA
STRUCTURES
4.1 CONTROL REGISTER ADDRESSES
The following table is an overview of the control
registers. The address is the word address which
is input by A6-1. To calculate the byte address, the
value has to be multiplied by two. The reset val-
ues of the control registers are shown in bold.
All control registers can be written to and read
(R/W), with the exception of the control bits that
initiate an action (W). The status registers can
only be read (R). When control registers which
contain bits that are not used or can only be read,
are written to, these bits can be set to 0 or 1; they
are not evaluated internally. If control registers
are read with bits that are not used, these bits are
set to 0.
A6-1
0H
Bit
0-15
0
Name
VERSION
RSTFL
1
SWRST
2
3
REPON
4
SREGEN
5
REGMODE
6
1H
7
POLRXD
8
PRESYNC
9
POLTXD
10
ENTSBAUD
11
SBAUD
12
RXDNRZ
13
WRSYNC
14
DMAMODE
15
R/W
Value
Function
R
2
Circuit code (0002H)
R/W
0
Reset has not taken place
1
Reset has taken place
W
0
Do not reset
1
Reset by software
(Not used)
R/W
0
Repeater turned off
1
Repeater turned on
R
Level at SREGEN pin
0
Sampling at the middle of bit
R/W
1
Sampling according to SERCOS interface
specification
R/W
R/W
0
Baud rate = fSCLK / 16
1
Baud rate = f_SCLK / 32
0
“Light on” when RxD = 0
1
“Light on” when RxD = 1
R/W
0
No pre-frame sync word
1
Pre-frame sync word
R/W
0
“Light on” when TxD = 0
1
“Light on” when TxD = 1
R/W
0
Baud rate selected by SWSBAUD pin
1
Baud rate selected by SWSBAUD control bit
R
Level at pin SBAUD
R/W
0
Receive data is NRZI-coded
1
Receive data is NRZI-coded
R/W
Direct RAM write access
RAM write access internally synchronized
R/W
0
DMAREQR/DMAREQT are static signals
1
DMAREQR/DMAREQT are pulses
(Not used)
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