BECKHOFF ET1100 - Manual (Page 88)

PDI description
III-74 Slave Controller – ET1100 Hardware Description
6.5 Synchronous 8/16 bit µController Interface
6.5.1 Interface
The synchronous µController interface uses demultiplexed address and data busses. The bidirectional
data bus can be either 8 bit or 16 bit wide. The signals of the synchronous µController interface of
EtherCAT devices are:
8/16 bit
µController
(sync)
CS
ADR
BHE
DATA
TA
EtherCAT
device
IRQ
RD/WR
TS
CPU_CLK_IN
EEPROM_LOADED
Figure 28: µController interconnection 4
Table 69: µController signals
Signal
sync I/F Signal
async I/F
Direction Description Signal polarity
CPU_CLK_IN N/A IN (µC → ESC) µController interface
clock
CS CS IN (µC → ESC) Chip select Typical: act. low
ADR[15:0] ADR[15:0] IN ( µC → ESC) Address bus act. high
BHE BHE IN (µC → ESC) Byte High Enable Typical: act. low
TS RD IN (µC → ESC) Transfer Start Typical: act. low
RD/nWR WR IN (µC → ESC) Read/Write access
DATA[15:0] DATA[15:0] BD (µC ↔ ESC) Data bus for 16 Bit
µController interface act. high
DATA[7:0] DATA[7:0] BD (µC ↔ ESC) Data bus for 8 Bit
µController interface act. high
TA BUSY OUT (ESC → µC) Transfer Acknowledge Typical: act. low
IRQ IRQ OUT (ESC → µC) Interrupt Typical: act. low
EEPROM_
LOADED EEPROM_
LOADED OUT (ESC → µC) PDI is active,
EEPROM is loaded act. high
6.5.2 Configuration
The 16 bit synchronous µController interface is selected with PDI type 0x0A in the PDI control register
0x0140, the 8 bit synchronous µController interface has PDI type 0x0B. It supports different
configurations, which are located registers 0x0150
– 0x0153.
4 All signals are denoted with typical polarity configuration.