UCB1510DB 데이터 시트보기 (PDF) - Philips Electronics

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UCB1510DB

AC97 digital modem codec

Philips Electronics 

Philips Semiconductors

UCB1510

AC97 digital modem codec

12.2 Codec addressing

Table 28: Codec addressing examples

CMD ADDR CMD DATA Codec ID

(A1, A0)

slot #0

bit 14

slot #0

bit 13

slot #0

bits 1 and 0

0

0

00

Read/Write

slot #1

bit 19

x

1

x

00

1

1

1

00

0

x

x

01

1

x

x

11

0

Transfer

Description

idle

primary read

primary write

secondary read

secondary write

No register data is transferred, slots 1

and 2 are not valid

Read for primary codec register

Write to a primary codec register

Read from the 01 secondary codec

register

Write to a 11 secondary codec register

12.2.1 Primary codec addressing

For addressing a primary codec, bits 1 and 0 of the Tag slot (codec ID A1 and A0)

should be 0. The bits 13 and 14 are used for register data transfer. When the

controller is not sending/receiving control data, it should be addressing the primary

codec. When writing to a register, the bits 14 and 13 (ADDR and DATA valid) should

be set to 1. When reading from a register, only the bit 14 is required to be 1.

12.2.2 Secondary codec addressing

When the Codec ID (A1,A0) is not 00, the controller is addressing a secondary codec

in a read or write sequence. The direction is defined in the slot 1 read/write bit (bit

19).

12.3 PCM sample transfer

Since the AClink frame frequency is defined to be 48kHz, exchanging samples with

the controller at a different sampling rate requires the support of on demand sample

transfer (slot request). The UCB1510 will send samples to the controller and assert

the slot 5 valid bit in the slot#0 (bit10)of the AClink frame. When it needs a new

sample from the controller, it will put a 0 on the slot5req bit in the slot#1 (bit9) of the

AClink frame. When the slot5req bit is 1, it indicates to the controller that no new

sample is needed. When the DAC is not active, the slot5req bit is kept at 0.

9397 750 06856

Preliminary specification

Rev. 01 — 4 February 2000

© Philips Electronics N.V. 2000. All rights reserved.

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