CS4205 查看數據表（PDF） - Cirrus Logic

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CS4205

CrystalClear® Audio Codec ’97 for Portable Computing

Cirrus Logic 

CS4205

5.15 Extended Audio ID Register (Index 28h)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

ID1 ID0 0

0

0

0 AMAP 0

0

0

0

0 VRM 0

0 VRA

ID[1:0]

AMAP

VRM

VRA

Default

Codec ID. These bits indicate the current codec configuration. When ID[1:0] = 00, the

CS4205 is the primary audio codec. When ID[1:0] = 01, 10, or 11, the CS4205 is a secondary

audio codec. The state of the ID[1:0] bits is determined at power-up from the ID[1:0]# pins

and the current clocking scheme, see Table 27 on page 63.

Audio Slot Mapping. The AMAP bit indicates whether the optional AC ’97 2.1 compliant

AC-link slot to audio DAC mapping is supported. This bit is a shadow of the AMAP bit in the

AC Mode Control Register (Index 5Eh). The PCM playback and capture slots are mapped ac-

cording to Table 14 on page 43.

Variable Rate Mic Audio. The VRM bit indicates whether variable rate Mic audio is supported.

This bit always returns ‘1’, indicating that variable rate mic audio is available.

Variable Rate PCM Audio. The VRA bit indicates whether variable rate PCM audio is support-

ed. This bit always returns ‘1’, indicating that variable rate PCM audio is available.

x209h. The Extended Audio ID Register (Index 28h) is a read-only register.

36

DS489PP4

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