
Introduction
27
November 2002 Revised January 2005
SPRS205D
Table 23. Signal Descriptions (Continued)
TERMINAL
NAME
RESET
CONDITION
BK
FUNCTION
I/O/Z
MULTIPLEXED
SIGNAL NAME
MULTICHANNEL BUFFERED SERIAL PORTS SIGNALS (CONTINUED)
McBSP1 receive frame synchronization or Secure Digital1 data2. At reset,
this pin is configured as McBSP1.FSR.
S12
I/O/Z
McBSP1.FSR
I/Z
McBSP1 receive frame synchronization. The McBSP1.FSR pulse initiates
the data receive process over McBSP1.DR.
Input
SD1.DAT2
I/O/Z
SD1 data2 is selected when the External Bus Selection Register has 10 in
the Serial Port1 Mode bit field.
S13
O/Z
McBSP1 serial data transmit or MultiMedia Card/Secure Digital1 serial
clock. At reset, this pin is configured as McBSP1.DX.
McBSP1.DX
O/Z
McBSP1 serial data transmit. McBSP1.DX is placed in the
high-impedance state when not transmitting, when RESET is asserted, or
when OFF is low. McBSP1.DX is selected when the External Bus
Selection Register has 00 in the Serial Port1 Mode bit field or following
reset.
BK
Hi-Z
MMC1.CLK
SD1.CLK
O
MMC1 or SD1 serial clock is selected when the External Bus Selection
Register has 10 in the Serial Port1 Mode bit field.
S14
I/O/Z
McBSP1 transmit clock or MultiMedia Card/Secure Digital1 data0. At
reset, this pin is configured as McBSP1.CLKX.
McBSP1.CLKX
I/O/Z
McBSP1 transmit clock. McBSP1.CLKX serves as the serial shift clock for
the serial port transmitter. The McBSP1.CLKX pin is configured as input
after reset. McBSP1.CLKX is selected when the External Bus Selection
Register has 00 in the Serial Port1 Mode bit field or following reset.
H
Input
MMC1.DAT
SD1.DAT0
I/O/Z
MMC1 or SD1 data0 is selected when the External Bus Selection Register
has 10 in the Serial Port1 Mode Bit field.
S15
I/O/Z
McBSP1 transmit frame synchronization or Secure Digital1 data3. At
reset, this pin is configured as McBSP1.FSX.
McBSP1.FSX
I/O/Z
McBSP1 transmit frame synchronization. The McBSP1.FSX pulse
initiates the data transmit process over McBSP1.DX. Configured as an
input following reset. McBSP1.FSX is selected when the External Bus
Selection Register has 00 in the Serial Port1 Mode bit field or following
reset.
Input
SD1.DAT3
I/O/Z
SD1 data3 is selected when the External Bus Selection Register has 10 in
the Serial Port1 Mode bit field.
S20
I/O/Z
McBSP2
command/response. At reset, this pin is configured as McBSP2.CLKR.
receive
clock
or
MultiMedia
Card/Secure
Digital2
McBSP2.CLKR
I
McBSP2 receive clock. McBSP2.CLKR serves as the serial shift clock for
the serial port receiver. McBSP2.CLKR is selected when the External Bus
Selection Register has 00 in the Serial Port2 Mode bit field or following
reset.
H
Input
MMC2.CMD
SD2.CMD
I/O/Z
MMC2 or SD2 command/response is selected when the External Bus
Selection Register has 10 in the Serial Port2 Mode bit field.
I = Input, O = Output, S = Supply, Hi-Z = High-impedance
BK = bus keeper (the bus keeper maintains the previous voltage level during reset or while the output pin is not driven), PU = pullup,
PD = pulldown, H = hysteresis input buffer, FS = fail-safe buffer