Beckhoff ET1200 User Manual download pdf (Page 43)

PDI Description

Slave Controller – ET1200 Hardware Description III-33

6.2.8 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.

6.2.9 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.

6.2.10 Timing specifications

Table 37: Digital I/O timing characteristics ET1200

Parameter

Min

Max

Comment

DATA_setup

8 ns

Input data valid before LATCH_IN

DATA_hold

4 ns

Input data valid after LATCH_IN

LATCH_IN

8 ns

LATCH_IN high time

SOF

35 ns

45 ns

SOF high time

SOF_to_DATA_setup

1,2 µs

Input data valid after SOF, so that Inputs

can be read in the same frame

SOF_to_DATA_hold

1,6 µs

Input data invalid after SOF

input_event_delay

440 ns

Time between consecutive input events

OUTVALID

75 ns

85 ns

OUTVALID high time

DATA_to_OUTVALID

65 ns

Output data valid before OUTVALID

WD_TRIG

35 ns

45 ns

WD_TRIG high time

DATA_to_WD_TRIG

35 ns

Output data valid after WD_TRIG

OE_EXT_to_DATA_invalid

Not applicable for ET1200

output_event_delay

320 ns

Time between consecutive output events

BIDIR_DATA_valid

65 ns

Bidirectional mode: I/O valid before

OUTVALID

BIDIR_DATA_invalid

65 ns

Bidirectional mode: I/O invalid after

OUTVALID

BIDIR_event_delay

440 ns

Bidirectional mode: time between

consecutive input or output events

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