BECKHOFF EtherCAT IP Core for Xilinx FPGAs v2.04e - Manual (Page 91)

PDI Description
Slave Controller – IP Core for Xilinx FPGAs III-79
10.1.7 SOF
SOF indicates the start of an Ethernet/EtherCAT frame. It is asserted shortly after RX_DV=1 or EBUS
SOF. Input data is sampled in the time interval between t
SOF_to_DATA_setup
and t
SOF_to_DATA_setup
after the
SOF signal is asserted.
10.1.8 OUTVALID
A pulse on the OUTVALID signal indicates an output event. If the output event is configured to be the
end of a frame, OUTVALID is issued shortly after RX_DV=0 or EBUS EOF, right after the CRC has
been checked and the internal registers have taken their new values. OUTVALID is issued
independent of actual output data values, i.e., it is issued even if the output data does not change.
10.1.9 Timing specifications
Table 42: Digital I/O timing characteristics IP Core
Parameter Min Max Comment
t
DATA_setup
x 5 Input data valid before LATCH_IN
t
DATA_hold
x 5 Input data valid after LATCH_IN
t
LATCH_IN
x 5 LATCH_IN high time
t
SOF
40 ns – x 5 40 ns + x 5 SOF high time
t
SOF_to_DATA_setup
0 ns 1,2 µs - x 5 Input data valid after SOF, so that Inputs
can be read in the same frame
t
SOF_to_DATA_hold
1,6 µs + x 5 Input data invalid after SOF
t
input_event_delay
440 ns Time between consecutive input events
t
OUTVALID
80 ns – x 5 80 ns + x 5 OUTVALID high time
t
DATA_to_OUTVALID
80 ns – x 5 Output data valid before OUTVALID
t
WD_TRIG
40 ns – x 5 40 ns + x 5 WD_TRIG high time
t
DATA_to_WD_TRIG
20 ns + x 5 Output data valid after WD_TRIG
t
OE_EXT_to_DATA_invalid
0 ns x 5 Outputs zero or Outputs high impedance
after OE_EXT set to low
t
output_event_delay
320 ns Time between consecutive output events
t
OUT_ENA_valid
80 ns – x 5 OUT_ENA valid before OUTVALID
t
OUT_ENA_invalid
80 ns – x 5 OUT_ENA invalid after OUTVALID
5 EtherCAT IP Core: time depends on synthesis results