Cirrus Logic CS4202 - Manual (Page 30)

CS4202
30 DS549PP2
4.12 Extended Audio ID Register (Index 28h)
ID[1:0] Codec ID. These bits indicate the current codec configuration. When ID[1:0] = 00, the
CS4202 is the primary audio codec. When ID[1:0] = 01, 10, or 11, the CS4202 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 18 on page 49.
REV[1:0] AC ’97 Revision. The REV[1:0] bits indicate which version of the AC ’97 specification the co-
dec complies with. These bits always return ‘01’, indicating the CS4202 complies with
version 2.2 of the AC ’97 specification.
AMAP Audio Slot Mapping. The AMAP bit indicates whether the AC ’97 2.2 compliant AC-link slot to
audio DAC mapping is supported. This bit always returns ‘1’, indicating that audio slot map-
ping is supported. The PCM playback and capture slots are mapped according to Table 8 on
page 30.
DSA[1:0] DAC Slot Assignment. The DSA[1:0] bits control the mapping of output slots to the DAC/SRC
block as well as the serial data port. To satisfy AC ‘97 2.2 AMAP requirements, the default for
these bits will depend on the Codec ID as shown in Table 9. See Table 8 for all available Slot
Map settings.
SPDIF Sony/Philips Digital Interface. The SPDIF bit is ‘set’, indicating that the optional S/PDIF trans-
mitter is supported.
VRA 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.
Default x605h. The Extended Audio ID Register (Index 28h) is a read-only register, except for the
DSA[1:0] bits which are read/write.
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
ID1 ID0 0 0 REV1 REV0 AMAP 0 0 0 DSA1 DSA0 0 SPDIF 0 VRA
Slot Assignment Slot Mapping
DSA1
SPSA1
ASA1
DSA0
SPSA0
ASA0
DAC SDOUT SDO2
S/PDIF
ADC
L R L R L R L R L R
0 0 3 4 7 8 6 9 3 4 3 4
0 1 7 8 6 9 10 11 7 8 7 8
1 0 6 9 10 11 - - 6 9 6 11
1 1 10 11 - - - - 10 11 - -
Table 8. Slot Mapping for the CS4202
Codec ID DSA[1:0]
default
SPSA[1:0]
default
ASA[1:0]
default
0 00 01 00
1 01 10 00
2 01 10 00
3 10 11 00
Table 9. Slot Assignment Defaults