CP3BT23_14 Datasheet, PDF (190/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
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19.7.10 Audio DMA Control Register (ADMACR)
The ADMACR register is used to control the DMA support of the audio interface. In addition, it is used to
configure the automatic transmission of the audio control bits. After reset, this register is clear.
7
4
3
0
TMD
RMD
15
RMD
13
Reserved
12
11
ACO
10
8
ACD
The Receive Master DMA field specify which slots (audio channels) are supported by DMA,
i.e. when a DMA request is asserted to the DMA controller. If the RMDn bit is set for an
assigned slot n (RXDSAn = 1), a DMA request n is asserted, when the ARDRn is full. If the
RXDSAn bit for a slot is clear, the RMDn bit is ignored. The following table shows the receive
DMA request scheme.
RMD
0000
000
0010
0011
x1xx
1xxx
Table 19-8.
DMA Request Condition
None
ARDR0 full
ARDR1 full
ARDR0 full or ARDR1 full
Not supported on CPTBT23
TMD
The Transmit Master DMA field specifies which slots (audio channels) are supported by
DMA, i.e. when a DMA request is asserted to the DMA controller. If the TMD bit is set for an
assigned slot n (TXDSAn = 1), a DMA request n is asserted, when the ATDRn register is
empty. If the TXDSA bit for a slot is clear, the TMD bit is ignored. The following table shows
the transmit DMA request scheme.
TMD
0000
000
0010
0011
x1xx
1xxx
Table 19-9.
DMA Request Condition
None
ATDR0 empty
ATDR1 empty
ATDR0 empty or ATDR1 empty
Not suported on CP3BT23
ACD
ACO
The Audio Control Data field is used to fill the remaining bits of a 16-bit slot if only 13, 14, or
15 bits of PCM audio data are transmitted.
The Audio Control Output field controls the number of control bits appended to the PCM data
word.
00 – No Audio Control bits are appended.
01 – Append ACD0.
10 – Append ACD1:0.
11 – Append ACD2:0.
190 Advanced Audio Interface
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