CMI-8738 Datasheet, PDF (13/28 Pages) C-Media Electronics – C3DX PCI-Based HRTF 3D Extension Positional Audio Chip

Ver. 1.2
CMI-8738/PCI-SX AUDIO Specification
18-17
16
15
14
13
12
11-5
4
3-2
1-0
* Notice
Reserved
VIDWPDSB Sub ID write protect disabled. (default 0)
Reserved
MASK_EN Activate channel mask on Legacy DMA.
0
Disabled
1
Enabled
VIDWPDSB Write Protect of HSP Configuration Sub ID.
0
Protect.
1
No protect.
SFILENB
Let software contrl filter stepping at the front end DAC.
Reserved
MIDSMP
Enable 1/2 interpolation at the Front end DAC..
UPDDMA[1:0] For every the number of samples to notify updating TDMA position.
00 Every 2048 samples
01 Every 1024 samples
10 Every 512 samples.
11 Every 256 samples.
TWAIT[1:0] For controling the length of legacy BUS cycle.
00
3 PCICLK.
01
18 PCICLK.
10
24 PCICLK
11
32 PCICLK
REQ_SQ[2:0]
States of BusRequest Engine.
MM_DATA
Bus Master is using Bus.
MIDLE
Bus Master is not using Bus.
REQA/REQB
Channel 0/1 BusMaster Request.
GNTA/GNTB
Channel 0/1 BusMaster Grant.
ADRQ/BDRQ
Channel 0/1 DMA Request.
ADACK/BDACK
Channel 0/1 DMA Acknoledge.
AIRQ/BIRQ
Channel 0/1 Interrupt.
CX/BX
Channel 0/1 Busy.
T - DMA Position
Bit(s)
31-16
R/W
R
Name
TDMACN T
Address 1CH
Description
Current Byte/Word Count of DMA channel.
15-0
R
TDMAADR Current Address of DMA channel.
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