BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 - Manual (Page 121)

PDI Description
Slave Controller – IP Core for Altera FPGAs III-109
10.3.9 Timing Specification
Table 56: µController timing characteristics IP Core
Parameter Min Max Comment
PRELIMINARY TIMING
t
CS_to_BUSY
x 8 BUSY driven and valid after CS assertion
t
ADR_BHE_setup
x 8 ADR and BHE valid before RD assertion
t
RD_to_DATA_driven
0 ns 9 DATA bus driven after RD assertion
t
RD_to_BUSY
0 ns 9 x 8 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
9 a) without preceding write access or
t
WR_to_RD
≥ t
write_int
or configuration: write after
falling edge of WR
b) t
read_int
+ t
write_int
-t
WR_to_RD
9
b) with preceding write access and
t
WR_to_RD
< t
write_int
c) 245 ns 9 c) 8 bit access, absolute worst case with
preceding write access (t
WR_to_RD
=min
,
t
write_int
=max)
d) 285 ns 9 d) 16 bit access, absolute worst case with
preceding write access (t
WR_to_RD
=min
,
t
write_int
=max)
t
read_int
a) 110 ns
9
b) 150 ns 9
a) 150 ns
9
b) 190 ns 9
Internal read time
a) 8 bit access
b) 16 bit access
t
BUSY_to_DATA_valid
a) x
8 -5 ns
b) x 8 -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 9 DATA invalid after ADR or BHE change
t
CS_RD_to_DATA_release
0 ns 9 x 8 DATA bus released after CS deassertion or
RD deassertion
t
CS_to_BUSY_release
0 ns 9 x 8 BUSY released after CS deassertion
t
CS_delay
0 ns 9 Delay between CS deassertion an assertion
t
RD_delay
x 8 Delay between RD deassertion and
assertion
t
ADR_BHE_DATA_setup
x 8 ADR, BHE and Write DATA valid before WR
deassertion
t
ADR_BHE_DATA_hold
x 8 ADR, BHE and Write DATA valid after WR
deassertion
t
WR_active
x 8 WR assertion time
8 EtherCAT IP Core: time depends on synthesis results
9 EtherCAT IP Core: time depends on synthesis results, specified value has to be met anyway