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Multichannel Buffered Serial Port
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Table A-29. Input/Output Description (continued)
Signal Name
I/O
(2)
Primary
Primary
Reset Value
Control and
Audio Data
Voice Data
(1)
Internal
Function
Data
Signal Name
mcbspi_clkx
I/O
(5)
CLKX_int
Transmitter
0
✓
✓
✓
clock
(6)
mcbspi_fsx
I/O
(5)
FSX_int
Transmitter
0
✓
✓
✓
frame
synchronization
(7)
mcbsp1_clkr
I/O
(5)
CLKR_int
Receiver
1
✓
clock
(8)
mcbsp1_fsr
I/O
(5)
FSR_int
Receiver frame
0
✓
synchronization
(9)
(5)
I in slave mode, O in master mode
(6)
This pin can function also as receiver clock (CLKR_int) or both transmitter and receiver common clock.
(7)
This pin can function also as receiver FS (FSR_int) or both transmitter and receiver common FS.
(8)
This pin can function also as transmitter clock (CLKX_int) or both transmitter and receiver common clock.
(9)
This pin can function also as transmitter FS (FSX_int) or both transmitter and receiver common FS.
CAUTION
•
External pins mcbsp1_clkr and mcbsp1_fsr are connected to pads only for
McBSP1 module; other McBSP modules do not have these connections.
For these modules, clock and framing synchronization signals are
mcbspi_clkx and mcbspi_fsx pins, respectively.
•
External pin mcbsp1_clkx is not connected to pad for McBSP1 in
OMAP36xx in CYN package devices. mcbsp1_clkr must be used instead of
mcbsp1_clkx.
•
Data are transmitted to external devices interfacing with McBSP modules through the mcbspi_dx pin.
Data from those devices are received on the mcbspi_dr pin.
•
Control information is communicated through the following pins: mcbspi_clkx (transmit clock),
mcbsp1_clkr (receive clock), mcbspi_fsx (transmit frame-sync), and mcbsp1_fsr (receive frame-sync).
A.15.2.2 McBSP Modes
For all McBSP functions, McBSP modules can operate in master or slave mode. The difference between
these modes is the definition of the source of McBSP clocks and McBSP frames synchronization:
•
Master mode: McBSP module provides them to the external device.
•
Slave mode: McBSP module receives them from the external device.
The choice between the two modes depends of technical data of the external device and the type of
interface (protocols and data formats). For one McBSP module, there are four possible functions:
1. Transmit-and-receive master mode
2. Transmit-and-receive slave mode
3. Transmit-master and receive-slave mode
4. Transmit-slave and receive-master mode
NOTE:
For the OMAP36xx in CYN package devices, only modes 1 or 2 are possible
lists the base address and address space for the McBSP module instances.
3694
OMAP36xx Multimedia Device in CYN Package
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
