X20 system modules • Counter modules • X20DC1178
676
X20 system User's Manual 3.10
4.11.4.9.3.2 Setting operating parameters
Name:
CfO_PhysicalMode
This register defines the operating parameters for the SSI encoder to correctly evaluate the data from the encoder.
•
Parity:
Data with or without parity; an error is reported if there is an even or uneven parity mismatch.
•
Monoflop check:
The encoder uses the monoflop to signal the readiness to accept a new clock cycle.
•
Data coding:
Binary or gray coding of the data bits
•
Clock rate:
Speed of data transfer
Data type
Value
USINT
See bit structure.
Bit structure:
Bit
Name
Value
Information
00
No parity bit (no clock bit output)
01
Even parity bit
10
Uneven parity bit
0 - 1
Parity bit
11
Ignore parity bit (clock bit is output, but the result is ignored)
00
No monostable multivibrator check (no clock bit output)
01
Check - Low level
10
Check - High level
2 - 3
Monostable multivibrator testing
11
Check - Ignore level (clock bit is output, but the result is ignored)
0
Binary coding
4
Data coding
1
Gray coding
5
Reserved
0
00
1 MHz
01
500 kHz
10
250 kHz
6 - 7
Clock rate
11
125 kHz
Transfer to synchronous serial interface
Clock
Data
Bit n
Bit n - 1
Bit n - 3
Bit 1
Bit 0
1
2
3
4
Measurement value processing
1 Starting bit ... Stores the measurement value
2 Output of first data bit
3 All data bits are transferred, monostable multivibrator time starts counting down.
4 Monostable multivibrator returns to its initial state. A new transfer can be started.
4.11.4.9.3.3 Number of data bits
Name:
Cfo_DataBits
This register can be used to define the number of SSI encoder data bits.
Data type
Value
Filter
USINT
1 to 32
Number of SSI data bits
4.11.4.9.3.4 Leading zeros of the encoder
Name:
Cfo_NullBits
This register can be used to define the number of SSI encoder leading zeros.
Data type
Value
Filter
USINT
1 to 32
Number of leading zeros
