SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 281
SC2200
Manufacturer Part Number
SC2200
Description
Thin Client On a Chip
Manufacturer
NSC [National Semiconductor]
Datasheet
1.SC2200.pdf
(433 pages)
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Revision 3.0
Core Logic Module
Offset 41h
Audio Bus Master 4: Output to codec; 16-Bit; Slot 6 or 11 (F3BAR0+Memory Offset 08h[19] selects slot).
Offset 42h-43h
Offset 44h-47h
Audio Bus Master 4: Output to codec; 16-Bit; Slot 6 or 11 (F3BAR0+Memory Offset 08h[19] selects slot).
Note:
Offset 48h
Audio Bus Master 5: Input from codec; 16-Bit; Slot 6 or 11 (F3BAR0+Memory Offset 08h[20] selects slot).
31:2
7:2
1:0
7:4
2:1
Bit
1
0
3
0
Table 5-38. F3BAR0+Memory Offset: XpressAUDIO Configuration Registers (Continued)
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.
Description
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. Bus master transferred data which is marked by the EOP bit in the PRD table (bit 30).
0: No.
1: Yes.
Pointer to the Physical Region Descriptor Table. This register is a PRD table pointer for Audio Bus Master 4.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 4 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.
Reserved. Must be set to 0.
Reserved. Must be set to 0. Must return 0 on reads.
Read or Write Control. Set the transfer direction of Audio Bus Master 5.
0: PCI reads are performed.
1: PCI writes are performed.
This bit must be set to 1 (write) and should not be changed when the bus master is active.
Reserved. Must be set to 0. Must return 0 on reads.
Bus Master Control. Controls the state of the Audio Bus Master 5.
0: Disable.
1: Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing 0 to this bit, the bus master must be either
paused or have reached EOT. Writing 0 to this bit while the bus master is operating, results in unpredictable behavior (and
may crash the bus master state machine). The only recovery from this condition is a PCI reset.
DWORD 0:
DWORD 1:
(Continued)
[31:0]
31
30
29
[28:16]
[15:0]
Audio Bus Master 4 PRD Table Address (R/W)
Audio Bus Master 5 Command Register (R/W)
Audio Bus Master 4 SMI Status Register (RC)
= Memory Region Physical Base Address
= End of Table Flag
= End of Page Flag
= Loop Flag (JMP)
= Reserved (0)
= Byte Count of the Region (Size)
Not Used
281
Reset Value: 00000000h
Reset Value: 00h
Reset Value: 00h
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