cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 8

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

TIMING PARAMETERS
Notes: 8. AEN must be high during DMA cycles.
8
Parallel Bus Timing
IOW or IOR strobe width
Data valid to IOW rising edge
IOR falling edge to data valid (read cycle)
SA <> and AEN setup to IOR or IOW falling edge
SA <> and AEN hold from IOW or IOR rising edge
DACK<> inactive to IOW or IOR falling edge (DMA cycle
immediately followed by a non-DMA cycle)
DACK<> active from IOW or IOR rising edge (non-DMA
cycle completion followed by DMA cycle)
DACK<> setup to IOR falling edge (DMA cycles)
DACK<> setup to IOW falling edge
Data hold from IOW rising edge
DRQ<> hold from IOW or IOR falling edge
(assumes no more DMA cycles needed)
Time between rising edge of IOW or IOR to next falling
edge of IOW or IOR
Data hold from IOR rising edge
DACK<> hold from IOW rising edge
DACK<> hold from IOR rising edge
RESDRV pulse width high
Initialization Time
EEPROM Read Time
XTAL, 16.9344 MHz, frequency
XTALI high time
XTALI low time
Sample Frequency
Serial Port Timing
SCLK rising to SDOUT valid
SCLK rising to FSYNC transition
SDIN valid to SCLK falling
SDIN hold after SCLK falling
10. EEPROM read time is dependent on amount of data in EEPROM. Minimum time relates to no
11. The Sample frequency specification must not be exceeded.
9. Initialization time depends on the power supply circuitry, as well as the the type of clock used.
EEPROM present. Maximum time relates to EEPROM data size of 2k bytes.
Parameter
(Continued)
DTM(I10) = 0
DTM(I10) = 1
(Notes 1, 11)
(Notes 1, 11)
(Notes 1, 11)
(Note 1, 10) t
(write cycle)
(Note 1, 9)
(Note 8)
(Note 8)
(Note 8)
(Note 1) t
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
Symbol
EEPROM
RESDRV
t
t
t
t
t
t
t
t
t
t
t
t
t
t
SUDK1
SUDK2
DKSUa
DKSUb
DKHDa
DKHDb
WDSU
BWDN
t
RDDV
ADHD
DRHD
ADSU
DHD2
DHD1
t
t
t
STW
t
t
INIT
PD1
PD2
Fs
S1
H1
16.92
3.918
Min
130
-25
-20
90
22
22
10
60
25
25
15
80
25
25
24
24
30
30
0
0
1
1
-
-
-
16.95
1200
Max
420
60
45
25
50
60
20
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CS4237B
DS213PP4
Units
MHz
kHz
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns