sercon410b STMicroelectronics, sercon410b Datasheet - Page 21

• Manufacturer Part Number: sercon410b
• Description: Sercos Interface Controller
• Manufacturer: STMicroelectronics

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.
A6-1
0H
1H
0-15
Bit
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
VERSION
RSTFL
SWRST
REPON
SREGEN
REGMODE
POLRXD
PRESYNC
POLTXD
ENTSBAUD
SBAUD
RXDNRZ
WRSYNC
DMAMODE
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
R
R
R
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.
Value
2
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Circuit code (0002H)
Reset has not taken place
Reset has taken place
Do not reset
Reset by software
Repeater turned off
Repeater turned on
Level at SREGEN pin
Sampling at the middle of bit
Sampling according to SERCOS interface
specification
Baud rate = f
(Not used)
Baud rate = f
“Light on” when RxD = 0
“Light on” when RxD = 1
No pre-frame sync word
Pre-frame sync word
“Light on” when TxD = 0
“Light on” when TxD = 1
Baud rate selected by SWSBAUD pin
Baud rate selected by SWSBAUD control bit
Level at pin SBAUD
Receive data is NRZI-coded
Receive data is NRZI-coded
Direct RAM write access
RAM write access internally synchronized
DMAREQR/DMAREQT are static signals
DMAREQR/DMAREQT are pulses
(Not used)
SCLK
SCLK
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Function
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SERCON410B
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