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Functional Description
22.3.5.4 Clocking Examples
Some examples of processes using the McASP clocking and frame flexibility are:
• Receive data from a DVD at 48 kHz, but output up-sampled or decoded audio at 96 kHz or 192 kHz.
This could be accomplished by inputting a high-frequency master clock (for example,
512 × receive FS), receiving with an internally-generated bit clock ratio of divide-by-8, and transmitting
with an internally-generated bit clock ratio of divide-by-4 or divide-by-2.
• Transmit/receive data based on one sample rate (for example, 44.1 kHz), and transmit/receive data at
a different sample rate (for example, 48 kHz).
22.3.6 Signal Descriptions
The signals used on the McASP audio interface are listed in Table 22-6.
Table 22-6. McASP Interface Signals
Device Reset
Pin I/O/Z (RESET = 0) Description
Transmitter Control
AHCLKX I/O/Z Input Transmit high-frequency master clock
AFSX I/O/Z Input Transmit frame sync or left/right clock (LRCLK)
ACLKX I/O/Z Input Transmit bit clock
Receiver Control
AHCLKR I/O/Z Input Receive high-frequency master clock
AFSR I/O/Z Input Receive frame sync or left/right clock (LRCLK)
ACLKR I/O/Z Input Receive bit clock
Mute
AMUTE I/O/Z Input Mute output
AMUTEIN I/O/Z Input Mute input
Data
AXRn I/O/Z Input TX/RX data pins
22.3.7 Pin Multiplexing
The McASP signals share pins with other processor functions. For detailed information on the McASP pin
multiplexing and configuration, see the pin multiplexing information in the device-specific data manual.
3787
SPRUH73H–October 2011–Revised April 2013 Multichannel Audio Serial Port (McASP)
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