CS4265 datasheet(39/53 Pages) CIRRUS

39 / 53 page

CS4265

DS657A2

6.12.1 DAC Soft Ramp or Zero Cross Enable (Bits 7:6)

Function:

Soft Ramp Enable

Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally

ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock

periods. See Table 15 on page 39.

Zero Cross Enable

Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will

occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur

after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample

rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-

itored and implemented for each channel. See Table 15 on page 39.

Soft Ramp and Zero Cross Enable

Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or

muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level

change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms

at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is

independently monitored and implemented for each channel. See Table 15 on page 39.

6.12.2 Invert DAC Output (Bit 5)

Function:

When this bit is set, the output of the DAC will be inverted.

6.13 Status - Address 0Dh

For all bits in this register, a ‘1’ means the associated condition has occurred at least once since the

of the register. Status bits that are masked off in the associated mask register will always be ‘0’ in this

6.13.1 E to F C-buffer Transfer

Function:

Indicates the completion of an E to F C-buffer transfer. See “Channel Status Buffer Management” on

page 50 for more information.

Table 15. DAC Soft Cross or Zero Cross Mode Selection

DACSoft

DACZeroCross

Mode

Changes to affect immediately

Zero Cross enabled

Soft Ramp enabled

Soft Ramp and Zero Cross enabled (default)

654

Reserved

EFTC

ClkErr

Reserved

ADCOvfl

ADCUndrfl

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