IDTSTAC9758XXTAEB1XR IDT, Integrated Device Technology Inc, IDTSTAC9758XXTAEB1XR Datasheet - Page 108

• Manufacturer Part Number: IDTSTAC9758XXTAEB1XR
• Description: IC CODEC AC'97 6CH 2.3 48-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec '97r

Specifications of IDTSTAC9758XXTAEB1XR

• Data Interface: Serial
• Resolution (bits): 20 b
• Number Of Adcs / Dacs: 2 / 3
• Sigma Delta: Yes
• 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-TQFP, 48-VQFP
• Single Supply Voltage (typ): 3.3/5V
• Single Supply Voltage (min): 3.135V
• Single Supply Voltage (max): 3.465/5.25V
• Package Type: TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STAC9758XXTAEB1XR

IDT™
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
10.2. 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 STAC9758/9759 will disregard the Command Address and Command
Data (Slot 0, bits 14 and 13) tag bits when 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 alternative
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 (00 reserved for Primary; 01, 10, 11 indicate Secondary)
Table 25. Secondary CODEC Register Access Slot 0 Bit Definitions
Output Tag Slot (16-bits)
108
Description
STAC9758/9759
PC AUDIO
V 1.2 1206