Philips Semiconductors
UCB1510
AC97 digital modem codec
12. AC97 interface
12.1 Control register data transfer
The AClink frames is made of 13 slots. Slot0 is a 16-bit long tag slot, the remaining 12
slots are 20-bit long data transfer.
SYNC
Clock:12.288MHz
SDOUT (SLOT #)
48KHz
16 bits
20bits
#0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #0
Fig 6. AClink frame slot definition
Register update is done at the end of slot 2. The new register value is effective
thereafter.
Slot #0 and slot #3 to #12 are shared by all codecs (primary and secondary). Multiple
codecs using the same slot cannot be used at the same time. Slot #1 and slot #2 are
used for register transfer and are codec specific. Addressing is defined in the
Tag slot #0: The UCB1510 will send a 1 as Tag slot bit 15 whenever the AClink is
active (MLNK is 0).
9397 750 06856
Preliminary specification
Rev. 01 — 4 February 2000
© Philips Electronics N.V. 2000. All rights reserved.
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