SC2200 datasheet(282/433 Pages) NSC

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282

Revision 3.0

Core Logic Module (Continued)

Offset 49h

Audio Bus Master 5 SMI Status Register (RC)

Reset Value: 00h

Audio Bus Master 5: Input from codec; 16-Bit; Slot 6 or 11 (F3BAR0+Memory Offset 08h[20] selects slot).

7:2

Reserved

Bus Master Error. Indicates if hardware encountered a second EOP before software cleared the first.

0: No.

1: Yes.

If hardware encounters a second EOP (end of page) before software cleared the first, it causes the bus master to pause

until this register is read to clear the error.

End of Page. Indicates if the Bus master transferred data which is marked by the EOP bit in the PRD table (bit 30).

0: No.

1: Yes.

Offset 4Ah-4Bh

Not Used

Offset 4Ch-4Fh

Audio Bus Master 5 PRD Table Address (R/W)

Reset Value: 00000000h

Audio Bus Master 5: Input from codec; 16-Bit; Slot 6 or 11 (F3BAR0+Memory Offset 08h[20] selects slot).

31:2

Pointer to the Physical Region Descriptor Table. This bit field contains a PRD table pointer for Audio Bus Master 5.

When written, this register points to the first entry in a PRD table. Once Audio Bus Master 5 is enabled (Command Register

bit 0 = 1), it loads the pointer and updates this register (by adding 08h) so that it points to the next PRD.

When read, this register points to the next PRD.

1:0

Reserved. Must be set to 0.

Note:

The Physical Region Descriptor (PRD) table consists of one or more entries - each describing a memory region to or from

which data is to be transferred. Each entry consists of two DWORDs.

DWORD 0:

[31:0]

= Memory Region Physical Base Address

DWORD 1:

= End of Table Flag

= End of Page Flag

= Loop Flag (JMP)

[28:16]

= Reserved (0)

[15:0]

= Byte Count of the Region (Size)

Table 5-38. F3BAR0+Memory Offset: XpressAUDIO Configuration Registers (Continued)

Bit

Description

SC2200 Datasheet(PDF) 282 Page - National Semiconductor (TI)

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