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SERCON816
January 2003
Single-chip controller for SERCOS interface
Real time communication for industrial control
systems
8/16-bit bus interface, Intel and Motorola control
signals
Dual port RAM with 2048 word *16-bit
Data communications via optical fiber rings, RS
485 rings and RS 485 busses
Maximum transmission rate of 16 Mbaud with
internal clock recovery
Internal repeater for ring connections
Full duplex operation
Modulation of power of optical transmitter diode
Automatic transmission of synchronous and
data telegrams in the communication cycle
Flexible RAM configuration, communication
data stored in RAM (single or double buffer) or
transfer via DMA
Synchronization by external signal
Timing control signals
Automatic service channel transmission
Watchdog to monitor software and external
synchronization signals
Compatible mode to SERCON410B SERCOS
interface controller
100-pin plastic flat-pack casing
Figure 1. SERCON816 Block Diagram
bus interface
telegram-
processing
timing-
control
clock
reset
watch-
dog
inter-
rupt
serial interface
DMA
ADMUX
BUSM O D E[ 1 : 0 ]
BUSWI DTH
BYTED I R
SBAUD
SB AUD 1 6
TM0/1
L_ ERRN
REC AC TN
IDLE
INT0/1
CYC_CLK
CON_CLK
DIV_CLK
SC L K
SC L KO 2 / 4
WDOGN
MCLK
RSTN
DMAREQR/T
DMAACKNR/
T
Rx C
Rx D
TxC
TxD[6:1]
WRN D[15:0] A[15:0] BUSYN
RDN
ALEL
ALEH
BHEN
MCSN0/1
PC SN 0
PC S1
optical transmitter/
receiver or
RS-485 bus drive
PQFP100
ORDERING NUMBERS: SERC816
SERC816/TR
SERCOS INTERFACE CONTROLLER
SERCON816
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TABLE OF CONTENTS
1 GENERAL DESCRIPTION.................................................................................................................3
2 Pin Description ...................................................................................................................................5
3 Electrical (DC and AC) Characteristics ..............................................................................................7
3.1 Absolute Maximum Ratings .....................................................................................................7
3.2 Recommended Operating Conditions......................................................................................8
3.3 ELECTRICAL CHARACTERISTCS ........................................................................................8
3.4 Power Dissipation ....................................................................................................................9
3.4.1 Power Dissipation Considerations....................................................................................9
3.5 AC Electrical Characteristics..................................................................................................10
3.5.1 Clock Input MCLK...........................................................................................................10
3.5.2 Clock Input SCLK...........................................................................................................11
3.5.3 Address Latch.................................................................................................................11
3.5.4 Read Access of Control Registers..................................................................................12
3.5.5 Read Access of Dual Port RAM .....................................................................................13
3.5.6 Write Access to Control Registers..................................................................................14
3.5.7 Write Access to DUAL Port RAM ...................................................................................15
4 Control Registers and RAM Data Structures....................................................................................16
4.1 Control Register Addresses...................................................................................................16
4.2 Data Structures within the RAM.............................................................................................16
4.2.1 Telegram Headers..........................................................................................................16
4.2.2 Data Containers..............................................................................................................17
4.2.3 End Marker.....................................................................................................................18
4.2.4 Service Containers.........................................................................................................18
5 Additional Specifications, Tools and Support...................................................................................21
5.1 Additional Specifications ........................................................................................................21
5.2 Hardware and Software Components....................................................................................21
5.3 Tools ......................................................................................................................................21
6 Package Mechanical Data:
SERCON816 100 Pin Plastic Quad Flat Pack Package (PQFP100) ...............................................22
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SERCON816
1 GENERAL DESCRIPTION
The SERCOS interface controller SERCON816 is an integrated circuit for SERCOS interface communication
systems. The SERCOS interface is a digital interface for communication between systems which have to ex-
change information cyclically at short, fixed intervals (62,5 s to 65 ms). It is appropriate for the synchronous
operation of distributed control or test equipment (e.g. connection between drives and numeric control).
A SERCOS interface communication system consists of one master and several slaves. These units are
connected by a fiber optical ring. This ring starts and ends at the master. The slaves regenerate and repeat
their received data or send their own telegrams. By this method the telegrams sent by the master are re-
ceived by all slaves while the master receives data telegrams from the slaves. The optical fiber assures a
reliable high-speed data transmission with excellent noise immunity.
The SERCOS interface controller contains all the hardware-related functions of the SERCOS interface and
considerably reduces the hardware costs and the computing time requirements of the microprocessor. It is
the direct link between the electro-optical receiver and transmitter and the microprocessor that executes the
control algorithms. The SERCON816 can be used both for SERCOS interface masters and slaves.
The circuit contains the following functions (Fig. 1):
Interface to the microprocessor with a data bus width of 8 or 16 bits and with control lines according to
Intel or Motorola standards.
A serial interface for making a direct connection with the optical receiver and transmitter of the fiber optic ring
or with drivers to an electric ring or bus. Data and clock regeneration, the repeater for ring topologies and the
serial transmitter and receiver are integrated. The signals are monitored and test signals generated. The se-
rial interface operates up to 16 Mbaud without external circuitry.
A dual port RAM (2048 * 16 bit) for control and communication data. The organization of the memory is flexible.
Telegram processing for automatic transmission and monitoring of synchronous and data telegrams. Only
transmission data which is intended for the particular interface user is processed. The transmitted data is ei-
ther stored in the internal RAM (single or double buffer) or transferred via direct memory access (DMA). The
transmission of service channel information over several communication cycles is executed automatically.
In addition to the SERCOS interface the SERCON816 can also be used for other real-time communica-
tions tasks. As an alternative to the fiber optical ring also bus topologies with RS-485 signals are supported
(Fig. 4). The SERCON816 is therefore suitable for a wide range of applications.
Remark: The SERCON816 is based on the former SERCON410B SERCOS interface controller.
Figure 2. SERCON816 Pin Configuration
SERCON816
80 D12
D13
D14
D15
VDD
75 BHEN
A0
A1
70 VSS
A2
A3
A4
A5
A6
A7
65 VDD
A8
A9
A10
A11
60 VSS
A12
A13
A14
A15
55 VDD
ALEL
ALEH
WRN
51 RDN
VDD 1
SCLK
VSS
MCLK
SCLK04 5
SCLK02
TEST
VDD
OUTZ
NDTRO
RSTN 10
RxC
TxC
RxD
VSS 15
TxD1
TxD2
TxD3
VDD
TxD4 20
TxD5
TxD6
VSS
WDOGN
IDLE 25
RECACTN
VDD
SBAUD16
SBAUD
TM0 30
VSS 81
D11
D10
D9
D8 85
VDD
D7
D6
D5
D4 90
VSS
D3
D2
D1
D0 95
ADMUX
BUSMODE0
BUSMODE1
BUSWIDTH
BYTDIR 100
50 VSS
PCS1
PCSN0
MCSN1
MCSN0
45 BUSYN
INT0
INT1
VSS
DMAACKTN
40 DMAACKRN
DMAREQT
DMAREQR
VDD
DIV_CLK
35 CON_CLK
CYC_CLK
VSS
L_ERRN
31 TM1

SERC816

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Telecom Interface ICs SERCOS Interfce Cont
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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