BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 - Manual (Page 111)

PDI Description
Slave Controller – IP Core for Altera FPGAs III-99
10.2.11 Timing specifications
Table 51: SPI timing characteristics IP Core
Parameter Min Max Comment
PRELIMINARY TIMING
t
CLK
33 ns+x 5 SPI_CLK frequency (f
CLK
≤ 30 MHz)
t
SEL_to_CLK
x 5 First SPI_CLK cycle after SPI_SEL
asserted
t
CLK_to_SEL
a) x 5
b) t
CLK
/2+ x 5
Deassertion of SPI_SEL after last
SPI_CLK cycle
a) SPI mode 0/2, SPI mode 1/3 with
normal data out sample
b) SPI mode 1/3 with late data out sample
t
read
240 ns Only for read access between
address/command and first data byte.
Can be ignored if BUSY or Wait State
Bytes are used.
t
C0_to_BUSY_OE
t
CLK
BUSY OUT Enable assertion after sample
time of last command bit C0.
t
BUSY_valid
x 5 BUSY valid after BUSY OUT Enable
t
BUSY_OE_to_DO_valid
x 5 Only for SPI mode 0/2 with normal data
out sampling: Data byte 0 bit 7 valid after
deassertion of BUSY OUT Enable
t
SEL_to_DO_valid
x 5 Status/Interrupt Byte 0 bit 7 valid after
SPI_SEL asserted
t
SEL_to_DO_invalid
0 ns x 5 Status/Interrupt Byte 0 bit 7 invalid after
SPI_SEL deasserted
t
STATUS_valid
x 5 Time until status of last access is valid.
Can be ignored if status is not used.
t
access_delay
x 5 Delay between SPI accesses
t
DI_setup
x 5 SPI_DI valid before SPI_CLK edge
t
DI_hold
x 5 SPI_DI valid after SPI_CLK edge
t
CLK_to_DO_valid
x 5 SPI_DO valid after SPI_CLK edge
t
CLK_to_DO_invalid
0 ns SPI_DO invalid after SPI_CLK edge
t
IRQ_delay
160 ns Internal delay between AL event and
SPI_IRQ output to enable correct reading
of the interrupt registers.
5 EtherCAT IP Core: time depends on synthesis results