BECKHOFF EtherCAT IP Core for Xilinx FPGAs v2.04e - Manual (Page 108)

PDI Description
III-96 Slave Controller – IP Core for Xilinx FPGAs
10.3.9 Timing Specification
Table 53: µController timing characteristics IP Core
Parameter Min Max Comment
t
CS_to_BUSY
x 10 BUSY driven and valid after CS assertion
t
ADR_BHE_setup
x 10 ADR and BHE valid before RD assertion
t
RD_to_DATA_driven
0 ns 11 DATA bus driven after RD assertion
t
RD_to_BUSY
0 ns 11 x 10 BUSY asserted after RD assertion
t
read
External read time (RD assertion to BUSY
deassertion) with normal read busy output
(0x0152[0]). Additional 20 ns if delayed read
busy output is configured.
a) t
read_int
11 a) without preceding write access or
t
WR_to_RD
≥ t
prec_write
+ t
Coll
or configuration:
write after falling edge of WR
b) t
read_int
+ t
prec_write
+t
Coll
-t
WR_to_RD
11
b) with preceding write access and
t
WR_to_RD
< t
prec_write
+ t
Coll
c) 420 ns 11 c) 8 bit access, absolute worst case with
preceding write access (t
WR_to_RD
=min
,
t
prec_write
=max, t
Coll
=max)
d) 560 ns 11 d) 16 bit access, absolute worst case with
preceding write access (t
WR_to_RD
=min
,
t
prec_write
=max, t
Coll
=max)
t
read_int
a) 220 ns
11
b) 300 ns 11
Internal read time
a) 8 bit access
b) 16 bit access
t
prec_write
a) 180 ns
b) 260 ns Time for preceding write access
a) 8 bit access
b) 16 bit access
t
BUSY_to_DATA_valid
a) x
10 -5 ns
b) x 10 -20 ns
DATA bus valid after device BUSY is
deasserted
a) normal read busy output
b) delayed read busy output
t
ADR_BHE_to_DATA_invalid
0 ns 11 DATA invalid after ADR or BHE change
t
CS_RD_to_DATA_release
0 ns 11 x 10 DATA bus released after CS deassertion or
RD deassertion
t
CS_to_BUSY_release
0 ns 11 x 10 BUSY released after CS deassertion
t
CS_delay
0 ns 11 Delay between CS deassertion an assertion
t
RD_delay
x 10 Delay between RD deassertion and
assertion
t
ADR_BHE_DATA_setup
x 10 ADR, BHE and Write DATA valid before WR
deassertion
10 EtherCAT IP Core: time depends on synthesis results
11 EtherCAT IP Core: time depends on synthesis results, specified value has to be met anyway