BECKHOFF ET1200 - Manual (Page 11)

Overview
Slave Controller – ET1200 Hardware Description III-1
1 Overview
The ET1200 ASIC is an EtherCAT Slave Controller (ESC). It takes care of the EtherCAT
communication as an interface between the EtherCAT fieldbus and the slave application. The ET1200
supports different applications, from simple digital I/O nodes without external logic up to designs with a
µController and Distributed Clocks.
Table 1: ET1200 Main Features
Feature ET1200
Ports 2 permanent ports, optional one additional bridge port (each EBUS or
MII, max. one MII port)
FMMUs 3
SyncManagers 4
RAM 1 Kbyte
Distributed Clocks Yes, 64 bit
Process Data Interfaces

16 Bit Digital I/O (unidirectional/bidirectional)

SPI Slave
Power supply Two integrated voltage regulators (LDO) for I/O (5V to 3.3V) and logic
core/PLL (5V/3.3V to 2.5V), optional external power supply for I/O and
logic core/PLL.
I/O 3.3V compatible I/O
Package QFN48 (7x7 mm 2 )
Other features

Internal 1GHz PLL

Clock output for external devices (10, 20, 25 MHz)
The general functionality of the ET1200 EtherCAT Slave Controller (ESC) is shown in Figure 1:
ECAT
Processing
Unit
AutoForwarder +
Loopback
SyncManager
FMMU
ESC address space
User RAM Registers Process RAM
EEPROM
Distributed
Clocks
Monitoring Status
Reset
PHY
Management
Reset
SYNC LEDs I²C EEPROM
PHY MI
SPI / Digital I/O 0 1 3
EBUS/MII ports
LATCH
PDI
ECAT Interface PDI Interface
Figure 1: ET1200 Block Diagram