CS4239 datasheet(9/98 Pages) CIRRUS

9 / 98 page

TIMING PARAMETERS (Continued)

Parameter

Symbol

Min

Max

Units

Parallel Bus Timing

IOW or IOR strobe width

tSTW

Data valid to IOW rising edge

(write cycle)

tWDSU

IOR falling edge to data valid (read cycle)

tRDDV

SA <> and AEN setup to IOR or IOW falling edge

tADSU

SA <> and AEN hold from IOW or IOR rising edge

tADHD

DACK<> inactive to IOW or IOR falling edge (DMA cycle

immediately followed by a non-DMA cycle)

(Note 8)

tSUDK1

DACK<> active from IOW or IOR rising edge (non-DMA

cycle completion followed by DMA cycle)

(Note 8)

tSUDK2

0ns

DACK<> setup to IOR falling edge (DMA cycles)

DACK<> setup to IOW falling edge

(Note 8)

tDKSUa

tDKSUb

Data hold from IOW rising edge

tDHD2

DRQ<> hold from IOW or IOR falling edge

DTM(I10) = 0

(assumes no more DMA cycles needed)

DTM(I10) = 1

tDRHD

-25

Time between rising edge of IOW or IOR to next falling

edge of IOW or IOR

tBWDN

Data hold from IOR rising edge

tDHD1

025

DACK<> hold from IOW rising edge

DACK<> hold from IOR rising edge

tDKHDa

tDKHDb

RESDRV pulse width high

(Note 1)

tRESDRV

1ms

Initialization Time

(Note 1, 9)

tINIT

310

EEPROM Read Time

(Note 1, 10) tEEPROM

1190

XTAL, 16.9344 MHz, frequency

(Notes 1, 11)

16.92

16.95

MHz

XTALI high time

(Notes 1, 11)

XTALI low time

(Notes 1, 11)

Sample Frequency

(Note 1)

3.918

kHz

CS4610 DSP Serial Port Timing

SCLK rising to SDOUT valid

(Note 1)

tPD1

SCLK rising to FSYNC transition

(Note 1)

tPD2

-20

SDIN valid to SCLK falling

(Note 1)

tS1

SDIN hold after SCLK falling

(Note 1)

tH1

Notes:

8. AEN must be high during DMA cycles.

9. Initialization time depends on the power supply circuitry, as well as the the type of clock used.

10. EEPROM read time is dependent on amount of data in EEPROM. Minimum time relates to no

EEPROM present. Maximum time relates to EEPROM data size of 1k bytes.

11. The Sample frequency specification must not be exceeded.

CrystalClear Portable ISA Audio System

CS4239

DS253PP2

CS4239 Datasheet(PDF) 9 Page - Cirrus Logic

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