Receive Logic
Clock/Frame Generator
State Machine
Clock Check and
Serializer 0
Serializer 1
Serializer y
GIO
Control
DIT RAM
384 C
384 U
Optional
Transmit
Formatter
Receive
Formatter
Transmit Logic
Clock/Frame Generator
State Machine
McASPx (x = 0, 1, 2)
Peripheral
Configuration
Bus
McASP
DMA Bus
(Dedicated)
AHCLKRx
ACLKRx
AFSRx
AMUTEINx
AMUTEx
AFSXx
ACLKXx
AHCLKXx
AXRx[0]
AXRx[1]
AXRx[y]
Pins
Function
Receive Master Clock
Receive Bit Clock
Receive Left/Right Clock or Frame Sync
Transmit Master Clock
Transmit Bit Clock
Transmit Left/Right Clock or Frame Sync
Transmit/Receive Serial Data Pin
Transmit/Receive Serial Data Pin
Transmit/Receive Serial Data Pin
Error Detection
The McASPs DO NOT have
dedicated AMUTEINx pins.
OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
www.ti.com
6.16 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
The three McASPs on the OMAP-L137 are configured with the following options:
Table 6-45. OMAP-L137 McASP Configurations
(1)
Module
Serializers
AFIFO
DIT
OMAP-L137 Pins
64 Word RX
AXR0[15:0], AHCLKR0, ACLKR0, AFSR0, AHCLKX0, ACLKX0,
McASP0
16
N
64 Word TX
AFSX0, AMUTE0
64 Word RX
AXR1[11:10], AXR1[8:0], AHCLKR1, ACLKR1, AFSR1, AHCLKX1,
McASP1
12
N
64 Word TX
ACLKX1, AFSX1, AMUTE1
16 Word RX
AXR2[3:0], AHCLKR2, ACLKR2, AFSR2, AHCLKX2, ACLKX2,
McASP2
4
Y
16 Word TX
AFSX2, AMUTE2
(1)
Pins available are the maximum number of pins that may be configured for a particular McASP; not including pin multiplexing.
Figure 6-33. McASP Block Diagram
116
Peripheral Information and Electrical Specifications
Copyright © 2008–2014, Texas Instruments Incorporated
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