BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 - Manual (Page 100)

PDI Description
III-88 Slave Controller – IP Core for Altera FPGAs
10.1 Digital I/O Interface
10.1.1 Interface
The Digital I/O PDI is selected with PDI type 0x04. The signals of the Digital I/O interface are 2 :
EtherCAT
IP core
DATA_OUT[31:0]
LATCH_IN
OUTVALID
SOF
OE_EXT
WD_TRIG
DATA_IN[31:0]
I/O[31:0]
DATA_ENA
Figure 33: IP core digital I/O signals
Table 43: IP core digital I/O signals
Signal Direction Description Signal polarity
DATA_OUT[31:0] OUT Output data
DATA_IN[31:0] IN Input data
LATCH_IN IN External data latch signal act. High
OUTVALID OUT Output data is valid/Output event act. High
SOF OUT Start of Frame act. High
OE_EXT IN Output Enable act. High
WD_TRIG OUT Watchdog Trigger act. High
DATA_ENA OUT Enable external Output data driver act. High
NOTE: Unsupported Digital I/O control signal OE_CONF is assumed to be low.
The Digital I/O PDI supports 1-4 byte of digital I/O signals, with each byte individually configurable as
either input or output. At the IP core interface, the I/O signals are separated in input signals
(DATA_IN) and output signals (DATA_OUT). The corresponding I/O bytes and addresses are listed
below.
Table 44: Input/Output byte reference
I/O
Byte
I/O signal Output signal
Output
address
Input signal
Input
address
0 I/O[7:0] DATA_OUT[7:0] 0x0F00 DATA_IN[7:0] 0x1000
1 I/O[15:8] DATA_OUT[15:8] 0x0F01 DATA_IN[15:8] 0x1001
2 I/O[23:16] DATA_OUT[23:16] 0x0F02 DATA_IN[23:16] 0x1002
3 I/O[31:24] DATA_OUT[31:24] 0x0F03 DATA_IN[31:24] 0x1003
2 The prefix `PDI_DIGI_` is added to the Digital I/O interface signals if the EtherCAT IP Core is used.