BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 - Manual (Page 134)

Distributed Clocks SYNC/LATCH Signals
III-122 Slave Controller – IP Core for Altera FPGAs
11 Distributed Clocks SYNC/LATCH Signals
For details about the Distributed Clocks refer to Section I.
11.1 Signals
The Distributed Clocks unit of the IP Core has the following external signals (depending on the ESC
configuration):
EtherCAT
device
LATCH_IN0
SYNC_OUT1
SYNC_OUT0
LATCH_IN1
Figure 60: Distributed Clocks signals
Table 61: Distributed Clocks signals
Signal Direction Description
SYNC_OUT0/1 OUT SyncSignals (alias SYNC[1:0])
LATCH_IN0/1 IN LatchSignals (alias LATCH[1:0])
NOTE: SYNC_OUT0/1 are active high/push-pull outputs.
11.2 Timing specifications
Table 62: DC SYNC/LATCH timing characteristics IP Core
Parameter Min Max Comment
t
DC_LATCH
12 ns + x 13 Time between Latch0/1 events
t
DC_SYNC_Jitter
11 ns + x 1 SYNC0/1 output jitter
t
DC_SYNC_IRQ_pulse_width
40 ns SYNC0/1 pulse width if the SYNC0/1
signal is used as AL event request (PDI
interrupt) signal (masked by register
0x0220 ff.), and if acknowledge mode is
not used.
LATCH0/1
t
DC_LATCH
t
DC_LATCH
Figure 61: LatchSignal timing
SYNC0/1
t DC_SYNC_Jitter
Output event time
t DC_SYNC_Jitter
Figure 62: SyncSignal timing
13 EtherCAT IP Core: time depends on synthesis results