IDTSTAC9753AXTAED1X IDT, Integrated Device Technology Inc, IDTSTAC9753AXTAED1X Datasheet - Page 88

• Manufacturer Part Number: IDTSTAC9753AXTAED1X
• Description: IC CODEC AC'97 MIC/JACK 48-QFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec '97r

Specifications of IDTSTAC9753AXTAED1X

• Resolution (bits): 20 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 85 / 92
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STAC9753AXTAED1X

IDT™
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
9.2.
Secondary CODEC Register Access Definitions
The AC'97 Digital Controller can independently access Primary and Secondary CODEC registers by
using a 2-bit CODEC ID field (chip select) which is defined as the LSBs of Output Slot 0. For Sec-
ondary CODEC access, the AC'97 Digital Controller must invalidate the tag bits for Slot 1 and 2
Command Address and Data (Slot 0, bits 14 and 13) and place a non-zero value (01, 10, or 11) into
the CODEC ID field (Slot 0, bits 1 and 0).
As a Secondary CODEC, the STAC9752A/9753A will disregard the Command Address and Com-
mand Data (Slot 0, bits 14 and 13) tag bits unless it sees a 2-bit CODEC ID value (Slot 0, bits 1 and
0) that matches its configuration. In a sense the Secondary CODEC ID field functions as an alterna-
tive Valid Command Address (for Secondary reads and writes) and Command Data (for Secondary
writes) tag indicator.
Secondary CODECs must monitor the Frame Valid bit, and ignore the frame (regardless of the state
of the Secondary CODEC ID bits) if it is not valid. AC'97 Digital Controllers should set the frame valid
bit for a frame with a secondary register access, even if no other bits in the output tag slot except the
Secondary CODEC ID bits are set.
This method is designed to be backward compatible with existing AC'97 controllers and CODECs.
There is no change to output Slot 1 or 2 definitions.
Using three CODECs typically requires a controller to support SDATA_IN2.
Note:
12-3
†1-0
Bit
15
14
13
2
† New definitions for Secondary CODEC Register Access
Frame Valid
Slot 1 Valid Command Address bit (†Primary CODEC only)
Slot 2 Valid Command Data bit (†Primary CODEC only)
Slot 3-12 Valid bits as defined by AC'97
Reserved (Set to “0”)
2-bit CODEC ID field
Table 30. Secondary CODEC Register Access Slot 0 Bit Definitions
(00 reserved for Primary; 01, 10, 11 indicate Secondary)
Output Tag Slot (16-bits)
88
Description
STAC9752A/9753A
PC AUDIO
V 1.5 1206