AMD SC2200 manual Bit, 274

32580B Core Logic Module - Audio Registers - Function 3

Table 6-38. F3BAR0+Memory Offset: Audio Configuration Registers (Continued)

Bit Description

16Codec Status Valid. (Read Only) Indicates if the status in bits [15:0] of this register is valid. This bit is high during slots 3 to 11 of the AC97 frame (i.e., for approximately 14.5 µs), for every frame.

0:No.

1:Yes.

15:0	Codec Status. (Read Only) This is the codec status data that is received from the codec in slot 2 on SDATA_IN. Only bits
	[19:4] are used from slot 2. If this register is read with both bits 16 and 17 of this register set to 1, this field is updated in the
	current AC97 frame, and codec status data is valid. This bit field is updated only if the codec sent status data.
Offset 0Ch-0Fh		Codec Command Register (R/W)	Reset Value: 00000000h
31:24	Codec Command Address. Address of the codec control register for which the command is being sent. This address goes
	in slot 1 bits [19:12] on SDATA_OUT.
23:22	Codec Communication. Indicates the codec that the Core Logic module is communicating with.
	00: Primary codec.
	01: Secondary codec.
	10: Third codec.
	11: Fourth codec.
	Only 00 and 01 are valid settings for this bit field.
21:17	Reserved. Must be set to 0.

16Codec Command Valid. (Read Only) Indicates if the command in bits [15:0] of this register is valid.

0:No.

1:Yes.

This bit is set by hardware when a codec command is written to the Codec Command register. It remains set until the com- mand has been sent to the codec.

15:0	Codec Command. This is the command being sent to the codec in bits [19:4] of slot 2 on SDATA_OUT.
Offset 10h-11h		Second Level Audio SMI Status Register (RC)	Reset Value: 0000h

The bits in this register contain second level SMI status reporting. Top level is reported at F1BAR0+I/O Offset 00h/02h[1]. Reading this register clears the status bits at both the second and top levels. Note that bit 0 has a third level of status reporting which also must be "read to clear".

A read-only “Mirror” version of this register exists at F3BAR0+I/O Memory Offset 12h. If the value of the register must be read without clearing the SMI source (and consequently de-asserting SMI), F3BAR0+Memory Offset 12h can be read instead.

15:8 Reserved. Must be set to 0.

7Audio Bus Master 5 SMI Status. Indicates if an SMI was caused by an event occurring on Audio Bus Master 5.

0:No.

1:Yes.

SMI generation is enabled when Audio Bus Master 5 is enabled (F3BAR0+Memory Offset 48h[0] = 1).

An SMI is then generated when the End of Page bit is set in the Audio Bus Master 5 SMI Status Register (F3BAR0+Memory Offset 49h[0] = 1).

6Audio Bus Master 4 SMI Status. Indicates if an SMI was caused by an event occurring on Audio Bus Master 4.

0:No.

1:Yes.

SMI generation is enabled when Audio Bus Master 4 is enabled (F3BAR0+Memory Offset 40h[0] = 1).

An SMI is then generated when the End of Page bit is set in the Audio Bus Master 4 SMI Status Register (F3BAR0+Memory Offset 41h[0] = 1).

5Audio Bus Master 3 SMI Status. Indicates if an SMI was caused by an event occurring on Audio Bus Master 3.

0:No.

1:Yes.

SMI generation is enabled when Audio Bus Master 3 is enabled (F3BAR0+Memory Offset 38h[0] = 1).

An SMI is then generated when the End of Page bit is set in the Audio Bus Master 3 SMI Status Register (F3BAR0+Memory Offset 39h[0] = 1).

274 AMD Geode™ SC2200 Processor Data Book