OMAP-L137 Datasheet, PDF (130/219 Pages) Texas Instruments – Low-Power Applications Processor

OMAP-L137 Low-Power Applications Processor
SPRS563A – SEPTEMBER 2008 – REVISED OCTOBER 2008
www.ti.com
6.15 Multichannel Audio Serial Ports (McASP0, McASP1, and McASP2)
The McASP serial port is specifically designed for multichannel audio applications. Its key features are:
• Flexible clock and frame sync generation logic and on-chip dividers
• Up to sixteen transmit or receive data pins and serializers
• Large number of serial data format options, including:
– TDM Frames with 2 to 32 time slots per frame (periodic) or 1 slot per frame (burst)
– Time slots of 8,12,16, 20, 24, 28, and 32 bits
– First bit delay 0, 1, or 2 clocks
– MSB or LSB first bit order
– Left- or right-aligned data words within time slots
• DIT Mode (optional) with 384-bit Channel Status and 384-bit User Data registers
• Extensive error checking and mute generation logic
• All unused pins GPIO-capable
Additionally, while the OMAP-L13x McASP modules are backward compatible with the McASP on
previous devices; the OMAP-L13x McASP includes the following new features:
• Transmit & Receive FIFO Buffers for each McASP. Allows the McASP to operate at a higher sample
rate by making it more tolerant to DMA latency.
• Dynamic Adjustment of Clock Dividers
– Clock Divider Value may be changed without resetting the McASP
– A one-shot adjustment (+/-1 Input Clock) feature has been added to enable simple input/output
sample rate matching
The three McASPs on the OMAP-L137 are configured with the following options:
Table 6-38. OMAP-L137 McASP Configurations⁽¹⁾
Module
McASP0
McASP1
McASP2
Serializers
16
12
4
AFIFO
64 Word RX
64 Word TX
64 Word RX
64 Word TX
16 Word RX
16 Word TX
DIT
OMAP-L137 Pins
N
AXR0[15:0], AHCLKR0, ACLKR0, AFSR0, AHCLKX0, ACLKX0,
AFSX0, AMUTE0
N
AXR1[11:10], AXR1[8:0], AHCLKR1, ACLKR1, AFSR1, AHCLKX1,
ACLKX1, AFSX1, AMUTE1
Y
AXR2[3:0], AHCLKR2, ACLKR2, AFSR2, AHCLKX2, ACLKX2,
AFSX2, AMUTE2
(1) Pins available are the maximum number of pins that may be configured for a particular McASP; not including pin multiplexing.
130 Peripheral Information and Electrical Specifications
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