CYWUSB6935_10 Datasheet, PDF (26/36 Pages) Cypress Semiconductor – WirelessUSB™ LR 2.4 GHz DSSS Radio SoC

CYWUSB6935
AC Characteristics ^[14]
Table 37. SPI Interface^[16]
Parameter
Description
Min Typ Max Unit
t_{SCK_CYC}
SPI clock period
t_{SCK_HI}
(BURST
[15]
READ)
SPI clock high time
476
–
238
–
–
ns
–
ns
t_{SCK_HI}
SPI clock high time
158
–
–
ns
t_{SCK_LO}
SPI clock low time
158
–
–
ns
t_{DAT_SU}
t_{DAT_HLD}
t_{DAT_VAL}
t_{SS_SU}
t_{SS_HLD}
SCK
SS
MOSI
M ISO
SCK
SS
SPI input data setup time
10
–
–
ns
SPI input data hold time
97^[16]
–
–
ns
SPI output data valid time
77^[16]
– 174^[16] ns
SPI slave select setup time before first positive edge of SCK^[17]
250
–
s _{SPI slave select hold time after last negative edge of SCK}
80
–
Design ^{Figure 10. SPI Timing Diagram}
–
ns
–
ns
t_{SCK_CYC}
w _{t S C K _ H I}
t_{SCK_LO}
r ^{Ne t}SS_SU
SAMPLE
fo t _{D A T _ S U}
t_{DAT_HLD}
ed ^{data from m cu}
D _{R IV E}
data from m cu
t_{DAT_VAL}
data to m cu
data from m cu
data to m cu
end _{Figure 11. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram}
t_{SS_HLD}
d a ta
d a ta
t omm _{SCK_CYC}
t _ec t t _{SCK_HI}
Not ^{R every 8th SCK_HI}
SCK_LO
DRIVE
SCK_HI (BURST READ)
every 9^th SCK_HI
DRIVE
every 10^th SCK_HI
DRIVE
M IS O
data to mcu
data to mcu
data to mcu
data
t_{DAT_VAL}
Notes
14. AC values are not guaranteed if voltages on any pin exceed V_CC.
15. This stretch only applies to every 9th SCK HI pulse for SPI Burst Reads only.
16. For F_OSC = 13 MHz, 3.3V @ 25°C.
17. SCK must start low, otherwise the success of SPI transactions are not guaranteed.
Document Number : 38-16008 Rev. *G
Page 26 of 36
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