STAC9750XXTAEC1X IDT, Integrated Device Technology Inc, STAC9750XXTAEC1X Datasheet - Page 59

• Manufacturer Part Number: STAC9750XXTAEC1X
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of STAC9750XXTAEC1X

• 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: Compliant

IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
8.2.
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 STAC9750/9751 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.
Note:
12-3
†1-0
† New definitions for Secondary CODEC Register Access
Bit
15
14
13
2
Table 42. Secondary CODEC Register Access Slot 0 Bit Definitions
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)
Output Tag Slot (16-bits)
59
Description
STAC9750/9751
PC AUDIO
V 5.8 103106