Serial Audio Interface (IIS/EIAJ)
MOTOROLA
Audio Functions
17-5
17.2
SERIAL AUDIO INTERFACE (IIS/EIAJ)
There are a total of four serial audio interfaces. Each interface can handle Philips IIS or Sony EIAJ
protocol. Interface 1 is a receive/transmit interface. Interface 2 is transmit only, Interfaces 3 and 4 are
receive only. See
Table 17-4. Interface 1 has four pins connected, the others have three pins. Every serial
audio interface block has a 32-bit configuration register associated with it.
11
PDIR1RESYN
processor data in 1 resync
11
reg IntClear
10
PDIR2UNOV
Processor data in 2 under / over
10
reg IntClear
9
PDIR2RESYN
Processor data in 2 resync
9
reg IntClear
8
AUDIOTICK
“tick” interrupt
8
reg IntClear
7
U2CHANRCVOVER
Q2CHANOVERRUN
UQ2CHANERR
IEC 958 receiver 2 U/Q channel error
7
reg IntClear
6
PDIR3 RESYNC
Processor data in 3 resync
6
reg IntClear
5
PDIR3 FULL
Processor data in 3 full
5
read fromPDIR3
4
IIS1TXEMPTY
IIS1 transmit fifo empty
4
write to FIFO
3
IIS2TXEMPTY
IIS2 transmit fifo empty
3
write to FIFO
2
EBUTXEMPTY
ebu transmit fifo empty
2
write to FIFO
1
PDIR2 FULL
Processor data in 2 full
1
read from PDIR2
0
PDIR1 FULL
Processor data in 1 full
0
read from PDIR1
Table 17-3 InterruptEn3 InterruptClear3, InterruptStat3 Register Description
BIT INTERRUPT NAME
DESCRIPTION
VECTOR
HOW TO
CLEAR
25
EBU2CNEW
IEC958-2 receiver new C channel received
17
reg. IntClear3
24
EBU2VALNOGOOD IEC958-2 receiver validity bit not set
16
reg. IntClear3
23
EBU2SYMERR
IEC958-2 receiver symbol error
15
reg. IntClear3
22
EBU2BITERR
IEC958-2 receiver parity bit error
15
reg. IntClear3
18
UCHANRCVFULL
U2ChannelReceive register full
14
read rcv reg
17
UCHANRCVOVER
U2ChannelReceive register overrun
7
reg. IntClear3
16
QCHANRVFULL
Q2ChannelReceive register full
14
read rcv reg
15
QCHANOVERRUN
Q2ChannelReceive register overrun
7
reg. IntClear3
14
UQCHANSYNC
U/Q2 channel sync found
14
reg. IntClear3
13
UQCHANERR
U/Q2 channel framing error
7
reg IntClear3
Table 17-2 Interrupt Register Description (Continued)
BIT
INTERRUPT
NAME
DESCRIPTION
VECTOR
HOW TO
CLEAR
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Freescale Semiconductor, Inc.
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