tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 411
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tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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Register setting such as Volume (*)
14.3.3
clear pending DMA request if any
Write to DMA buffer and update
Dummy write to data register to
Stop updating DMA descriptor
DMA descriptor (repeatedly)
Disable transmit-data DMA
enable transmit-data DMA
Check completion status
Start DMA Channel and
Check AC’97 status
Setup DMA buffer
Start up AC-link
Configure DMAC
System Software
Disable ENLINK
Enable ENLINK
Usage Flow
subsequent sections for the details of each operation performed in this process flow. The diagrams
below describe the audio playback and recording processes. The modem transmission and reception
can be done in a similar way.
This section outlines a process flow when using the AC’97 connected to ACLC. Refer to the
(*) Register settings such as volume can be made during data playback.
Figure 14.3.3 Audio Playback Process Flow
Completion interrupt (repeatedly)
DMAC channel goes inactive
DMA underrun error occurs
DMAC generates Transfer
Start sending data to slot
Stop sending data to slot
Start transmit-data DMA
Stop transmit-data DMA
CODECRDY Interrupt
Deassert ACRESET*
Assert ACRESET*
ACLC and DMAC
14-5
Chapter 14 AC-link Controller
DAC Ready response
Start audio playback
Stop audio playback
Set CODEC Ready
Set volume, etc.
Start BITCLK
Stop BITCLK
Stop AC-link
AC’97
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