Audio Interface Module (AIM)
MCF5253 Reference Manual, Rev. 1
Freescale Semiconductor
17-3
17.1.2
Audio Interface Structure
The discussion in this section accompanies
by identifying the blocks called out (in bold) in the
diagram.
There are four serial audio interface blocks (
5–11
) labeled as follows:
1. IIS1: Capable of transmitting and receiving audio data.
2. IIS2: Transmit only.
3. IIS3: Receive only.
4. IIS4: Only SCLK4 input / output is available. This is intended to be used with the ADC circuit
under certain conditions see
Chapter 12, “Analog to Digital Converter (ADC)
”
for details.
As shown in
, there two IEC958 receivers. The source selector (
18)
and the receiver block itself
(
19)
. The receiver is capable of taking its input signal from four possible EBU inputs:
1. EBUIN1
2. EBUIN2
3. EBUIN3
4. EBUIN4
There is one IEC958 transmitter with two outputs (
30
), one carries the “consumer” C-channel, the other
the “professional” C-channel.
Four audio interface receivers (IIS1, IIS3, and the two EBU receivers) send their received data on an
internal 40-bit wide bus, the Internal Audio Data Bus. Every transmitter sources its data to be transmitted
from this same internal bus. Every transmitter has a multiplexer to select the data source. Possible sources
are (IIS1 receiver, IIS3 receiver, two EBU receivers, processor data output1, processor data output2,
processor data output 3). Every transmitter also has a FIFO after the multiplexer. This FIFO gives the data
source some freedom when data is generated. The FIFOs compensate for phase shifts when a transmitter
takes data from another receiver. In the case that the transmitter sends out processor-generated data, the
FIFO allows the processor to send several audio words in one burst to the audio transmitter.
To allow the processor to receive and transmit audio data, an interface is present between the internal
Audio Data Bus and the ColdFire memory space. As shown in
, this interface is seen in the
memory map as Processor Data Interface Registers. Three of these are Processor Data Out registers,
PDOR1, PDOR2 and PDOR3. When the processor writes to one of these registers, the data is sent directly
to the Internal Audio Data Bus, and depending on the setting of the multiplexers (
13, 15,
and
24)
it will
end up in one or several of the transmit FIFOs
(12, 14,
and
25)
. There are three Processor Data In registers,
PDIR1, PDIR2, and PDIR3. When the processor reads from one of these address locations, it actually
reads data from one of the FIFOs (
17
,
17a, or 17b)
. These FIFOs receive data from the Internal Audio
Data Bus using multiplexers
(16
,
16a, and 16b)
. Depending on the setting of the multiplexers, data from
one of the audio data receivers will end in the FIFOs. Possible receivers for the three PDIR channels are
IIS1 receiver, IIS3 receiver and the two IEC958 receivers.
Besides the mechanism to let the processor access the audio data, there are several interrupts and control
registers to allow the processor to determine when it should read or write data to the appropriate Processor
Data Interface Register.
Summary of Contents for MCF5253
Page 1: ...Document Number MCF5253RM Rev 1 08 2008 MCF5253 Reference Manual...
Page 26: ...MCF5253 Reference Manual Rev 1 xxvi Freescale Semiconductor...
Page 32: ...MCF5253 Reference Manual Rev 1 xxxii Freescale Semiconductor...
Page 46: ...MCF5253 Introduction MCF5253 Reference Manual Rev 1 1 14 Freescale Semiconductor...
Page 62: ...Signal Description MCF5253 Reference Manual Rev 1 2 16 Freescale Semiconductor...
Page 98: ...Instruction Cache MCF5253 Reference Manual Rev 1 5 10 Freescale Semiconductor...
Page 104: ...Static RAM SRAM MCF5253 Reference Manual Rev 1 6 6 Freescale Semiconductor...
Page 128: ...Synchronous DRAM Controller Module MCF5253 Reference Manual Rev 1 7 24 Freescale Semiconductor...
Page 144: ...Bus Operation MCF5253 Reference Manual Rev 1 8 16 Freescale Semiconductor...
Page 176: ...System Integration Module SIM MCF5253 Reference Manual Rev 1 9 32 Freescale Semiconductor...
Page 198: ...Analog to Digital Converter ADC MCF5253 Reference Manual Rev 1 12 6 Freescale Semiconductor...
Page 246: ...DMA Controller MCF5253 Reference Manual Rev 1 14 18 Freescale Semiconductor...
Page 282: ...UART Modules MCF5253 Reference Manual Rev 1 15 36 Freescale Semiconductor...
Page 344: ...Audio Interface Module AIM MCF5253 Reference Manual Rev 1 17 46 Freescale Semiconductor...
Page 362: ...I2 C Modules MCF5253 Reference Manual Rev 1 18 18 Freescale Semiconductor...
Page 370: ...Boot ROM MCF5253 Reference Manual Rev 1 19 8 Freescale Semiconductor...
