tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 412

• Manufacturer Part Number: tmpr4937
• Description: 64-bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Read from DMA buffer and update
Dummy read from data register to
clear pending DMA request if any
Register setting such as gain (*)
Stop updating DMA descriptor
DMA descriptor (repeatedly)
Disable receive-data DMA
enable receive-data DMA
Check completion status
Start DMA Channel and
Check AC’97 status
Start up AC-link
Clear DMA buffer
System Software
Configure DMAC
Disable ENLINK
Enable ENLINK
(*) Register settings such as gain can be made during data recording
Figure 14.3.4 Audio Recording Process Flow
Completion interrupt (repeatedly)
DMAC channel goes inactive
Start receiving data from slot
DMAC generates Transfer
DMA overrun error occurs
Receive-data DMA halts
Start receive-data DMA
CODECRDY Interrupt
Deassert ACRESET*
Assert ACRESET *
ACLC and DMAC
14-6
Chapter 14 AC-link Controller
ADC Ready response
Start recording audio
Set CODEC Ready
Send sample data
Start BITCLK
Set gain, etc.
Stop BITCLK
Stop AC-link
AC’97