serc816-tr STMicroelectronics, serc816-tr Datasheet - Page 3

• Manufacturer Part Number: serc816-tr
• Description: Sercos Interface Controller
• Manufacturer: STMicroelectronics

1
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
– A serial interface for making a direct connection with the optical receiver and transmitter of the fiber optic ring
– 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
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
Intel or Motorola standards.
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.
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.
GENERAL DESCRIPTION
BUSMODE0
BUSMODE1
BUSWIDTH
BYTDIR 100
ADMUX
VDD
VSS 81
VSS
D11
D10
D8 85
D4 90
D0 95
D7
D6
D5
D2
D9
D3
D1
SERCON816
40 DMAACKRN
50 VSS
45 BUSYN
35 CON_CLK
31 TM1
PCS1
PCSN0
MCSN1
DIV_CLK
CYC_CLK
VSS
MCSN0
INT0
INT1
VSS
DMAACKTN
DMAREQR
VDD
DMAREQT
L_ERRN
SERCON816
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