AK4541VQ Asahi Kasei Microsystems, AK4541VQ Datasheet - Page 15

• Manufacturer Part Number: AK4541VQ
• Description: AC97 Rev 2.1 Multimedia Audio CODEC
• Manufacturer: Asahi Kasei Microsystems

[ASAHI KASEI]
[AK4541]
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A new audio input frame begins with a low to high transition of SYNC. SYNC is synchronous to the rising edge of BIT_CLK. On the
immediately following falling edge of BIT_CLK, the AK4541 samples the assertion of SYNC. This falling edge marks the time when
both sides of AC-link are aware of the start of a new audio frame. On the next rising of BIT_CLK, the AK4541 transitions SDATA_IN
into the first bit position of slot 0 (“Codec Ready” bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK, and
subsequently sampled by the AC ’97 controller on the following falling edge of BIT_CLK. This sequence ensures that data transitions,
and subsequent sample points for both incoming and outgoing data streams are time aligned.
Audio input frame slot1’s stream echoes the control register index, for historical reference, for the data to be returned in slot2.
(Assuming that slots1 valid bit and slot2 valid bit in the slot0 had been tagged “valid” by the AK4541)
3
When the AC’97 is not ready for normal operation, output bits are not specified in this documents and should be considered as
invalid.
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1999/01