Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet
Product codes
AT91SAM9M10-G45-EK
1030
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
43.8.12
AC97 Controller Channel B Mode Register
Name:
AC97C_CBMR
Address:
0xFFFAC03C
Access:
Read-write
• TXRDY: Channel Transmit Ready Interrupt Enable
• TXEMPTY: Channel Transmit Empty Interrupt Enable
• UNRUN: Transmit Underrun Interrupt Enable
• RXRDY: Channel Receive Ready Interrupt Enable
• OVRUN: Receive Overrun Interrupt Enable
• ENDTX: End of Transmission for Channel B Interrupt Enable
• TXBUFE: Transmit Buffer Empty for Channel B Interrupt Enable
0: Read: the corresponding interrupt is disabled. Write: disables the corresponding interrupt.
1: Read: the corresponding interrupt is enabled. Write: enables the corresponding interrupt.
• ENDRX: End of Reception for Channel B Interrupt Enable
0: Read: the corresponding interrupt is disabled. Write: disables the corresponding interrupt.
1: Read: the corresponding interrupt is enabled. Write: enables the corresponding interrupt.
• RXBUFF: Receive Buffer Full for Channel B Interrupt Enable
0: Read: the corresponding interrupt is disabled. Write: disables the corresponding interrupt.
1: Read: the corresponding interrupt is enabled. Write: enables the corresponding interrupt.
• SIZE: Channel B Data Size
SIZE Encoding
Note:
Each time slot in the data phase is 20 bit long. For example, if a 16-bit sample stream is being played to an AC 97 DAC, the first
16 bit positions are presented to the DAC MSB-justified. They are followed by the next four bit positions that the AC97 Controller
fills with zeroes. This process ensures that the least significant bits do not introduce any DC biasing, regardless of the imple-
mented DAC’s resolution (16-, 18-, or 20-bit)
16 bit positions are presented to the DAC MSB-justified. They are followed by the next four bit positions that the AC97 Controller
fills with zeroes. This process ensures that the least significant bits do not introduce any DC biasing, regardless of the imple-
mented DAC’s resolution (16-, 18-, or 20-bit)
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
PDCEN
CEN
–
–
CEM
SIZE
15
14
13
12
11
10
9
8
RXBUFF
ENDRX
–
–
TXBUFE
ENDTX
–
–
7
6
5
4
3
2
1
0
–
–
OVRUN
RXRDY
–
UNRUN
TXEMPTY
TXRDY
SIZE
Selected Data Size
0x0
20 bits
0x1
18 bits
0x2
16 bits
0x3
10 bits