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SERC816

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
19/23
SERCON816
For master mode (SCMASTER = 1) the control words are coded as follows:
Index Bit Name Function
0 0 HS_MDT Handshake-bit in MDT
1 L/S_MDT Read/write in MDT
2 END_MDT End in MDT
3-5 ELEM_MDT Data element type in MDT
6 SETEND END_MDT is to be set
7 M_BUSY Service container waits for interaction of microprocessor
(M_BUSY = 1)
8-9 NINFO_WRITE Number of info words in write buffer (1 to 4)
10-11 (Not used)
12 INT_ERR Slave reports error
13 INT_END_WRBUF End of write buffer is reached
14 INT_END_RDBUF End of read buffer is reached
15 (Not used)
1 0 HS_AT Handshake bit in AT
1 BUSY_AT Busy bit in AT
2 ERR_AT Error bit in AT
3 CMD_AT Command modification bit in AT
4-6 (Not used)
7 RECERR Last transmission was correct (0) or erroneous (1)
8-9 NINFO_READ Number of info words in read buffer (1 to 4)
10-15 (Not used)
2 0-7 WRDATPT Pointer to present position in write buffer
8-15 WRDATLAST Pointer to last position in write buffer
3 0-7 RDDATPT Pointer to present position in read buffer
8-15 RDDATLAST Pointer to last position in read buffer
4 0-7 ERR_CNT Error counter
8 BUSY_CNT Error counts differences of handshake (0) or BUSY cycles (1)
9 INT_SC_ERR Interrupt due to protocol error
10 INT_HS_TIMEOUT Interrupt due to handshake timeout
11 INT_BUSY_TIMEOUT Interrupt BUSY timeout
12 INT_CMD Slave has set command modification bit
13-15 (Not used)
SERCON816
20/23
The coding of the five control words depends on the mode of the service channel. Using the slave mode
(SCMASTER = 0) they have the following structure:
Index Bit Name Function
0 0 HS_AT Handshake bit in AT
1 BUSY_AT Busy bit in AT, also waiting for microprocessor interaction
2 ERR_AT Error bit in AT
3 CMD_AT Command modification bit in AT
4-6 ELEM Data element of present transmission
7 L/S Read (0)/write (1) of present transmission
8-9 NINFO_WRITE Number of info words in write buffer (1 to 4)
10-11 (Not used)
12 INT_ELEM_CHANGE Master has modified data element or read/write
13 INT_END_WRBUF End of write buffer is reached
14 INT_END_RDBUF End of read buffer is reached
15 INT_END_MDT Master reports end via END_MDT-bit
1 0 HS_MDT Handshake bit in MDT
1 L/S_MDT Read/write in MDT
2 END_MDT End bit in MDT
3-5 ELEM_MDT Data element in MDT
6 (Not used)
7 RECERR Last transmission was correct (0) or erroneous (1)
8-9 NINFO_READ Number of info words in read buffer (1 to 4)
10-15 (Not used)
2 0-7 WRDATPT Pointer to present position in write buffer
8-15 WRDATLAST Pointer to last position in write buffer
3 0-7 RDDATPT Pointer to present position in read buffer
8-15 RDDATLAST Pointer to last position in read buffer
4 0-8 (Not used)
9 INT_SC_ERR Interrupt due to protocol error
10-15 (Not used)
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SERCON816
5 ADDITIONAL SPECIFICATIONS, TOOLS AND SUPPORT
5.1 Additional Specifications
Reference Manual SERCON816
The reference manual (160 pages) for the SERCON816 Asic contains a complete and very detailed spec-
ification of the SERCON816 Asic, including a description of the pinning of the controller, microprocessor
interface, serial interface, telegram processing, master and slave modes, additional modes, control and
RAM data structures, programming examples, electrical and mechanical characteristics of the chip, differ-
ences between SERCON816 and SERCON410B controller.
SERCOS interface specification
The SERCOS interface specification (IEC/EN 61491) contains a detailed description of the transfer medi-
um and physical layer, data transfer and data link layer, protocol structure and data contents, communi-
cation phases, functional handling and error handling, list and description of identifier numbers.
I/O functions are described in a separate document.
5.2 Hardware and Software Components
Master and slave routines (driver software) for the SERCON816 controller are available from several sup-
pliers world-wide. Furthermore different boards for a wide range of computer interfaces are offered, includ-
ing ISA-, VME-, PCI- and PC/104 bus systems.
5.3 Tools
Different development and testing tools are available for SERCOS interface.
These tools include bus monitors, configuration and simulation tools, as well as tools for conformance test-
ing.
For all specification and additional application notes please contact:
Interests Group SERCOS interface e. V.
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SERC816

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Manufacturer:
STMicroelectronics
Description:
Telecom Interface ICs SERCOS Interfce Cont
Lifecycle:
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