Cirrus Logic CS8406 - Manual (Page 7)

DS580F6 7
CS8406
SWITCHING CHARACTERISTICS - CONTROL PORT - SPI MODE
(Inputs: Logic 0 = 0 V, Logic 1 = VL; C
L
= 20 pF)
Notes:
9. If Fs is lower than 51.850 kHz, the maximum CCLK frequency should be less than 115 Fs. This is dic-
tated by the timing requirements necessary to access the Channel Status and User Bit buffer memory.
Access to the control register file can be carried out at the full 6 MHz rate.
10. T
sch
must be greater than the larger of the two values, either 1/256FS + 8 ns, or 66 ns.
11. Data must be held for sufficient time to bridge the transition time of CCLK.
12. For f
sck
< 1 MHz.
Parameter Symbol Min Typ Max Units
CCLK Clock Frequency (Note 9) f
sck
0 - 6.0 MHz
CS High Time Between Transmissions t
csh
1.0 - -  s
CS Falling to CCLK Edge t
css
20 - - ns
CCLK Low Time t
scl
66 - - ns
CCLK High Time (Note 10) t
sch
MAX ((1/256 F
S
+ 8), 66) ns
CDIN to CCLK Rising Setup Time t
dsu
40 - - ns
CCLK Rising to DATA Hold Time (Note 11) t
dh
15 - - ns
CCLK Falling to CDOUT Stable t
pd
- - 50 ns
Rise Time of CDOUT t
r1
- - 25 ns
Fall Time of CDOUT t
f1
- - 25 ns
Rise Time of CCLK and CDIN (Note 12) t
r2
- - 100 ns
Fall Time of CCLK and CDIN (Note 12) t
f2
- - 100 ns
t r2 t f2
t dsu
t dh
t sch t scl
CS
CCLK
CDIN
t css
t pd
CDOUT
tcsh
Figure 3. SPI Mode Timing