Allwinner A20 - Page 734

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 734 / 812
6.10.7.8. AC97 FIFO STATUS REGISTER
Offset: 0x1C
Register Name: AC_FSTA
Default Value: 0x0000_C000
Bit
Read/Write
Default
Description
31:16
/
/
/
15
R
1
TXE
TX FIFO Empty
0: No room for new sample in TX FIFO
1: More than one room for new sample in TX FIFO ( >=1
word )
14:7
R
0x80
TXE_CNT
TX FIFO Empty Space Word counter
6
R
0
RXA
RX FIFO Available
0: No available data in RX FIFO
1: More than one sample in RX FIFO ( >=1 word )
5:0
R
0
RXA_CNT
RX FIFO Available Sample Word counter
6.10.7.9. AC97 INTERRUPT CONTROL REGISTER
Offset: 0x20
Register Name: AC_INT
Default Value: 0x0000_0000
Bit
Read/Write
Default
Description
31:10
/
/
/
9
R/W
0
CODEC_GPIO_EN
Codec GPIO interrupt enable
0: Disable
1: Enable
8
R/W
0
CREN
Codec Ready interrupt enable
0: Disable