Preliminary
PRODUCT OVERVIEW
S3C2451X RISC MICROPROCESSOR
1-32
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Signal In/Out
Description
DP_UDEV
IO
DATA(+) for USB peripheral.
REXT
O
External Resistor ( 44.2ohm +/- 1%)
XO_UDEV OSC
Crystal
output
XI_UDEV
OSC
Crystal input
SPI
SPIMISO[1:0]
IO
SPIMISO is the master data input line, when SPI is configured as a master.
When SPI is configured as a slave, these pins reverse its role.
SPIMOSI[1:0]
IO
SPIMOSI is the master data output line, when SPI is configured as a master.
When SPI is configured as a slave, these pins reverse its role.
SPICLK[1:0]
IO
SPI clock
nSS[1:0]
I
SPI chip select (only for slave mode)
SDMMC Interface
SD1_DAT[7:0]
IO
SD1 receive/transmit data
SD1_CMD
IO
SD1 receive response/ transmit command
SD1_CLK O
SD1
clock
SD1_nWP
O
SD1 Write Protect
SD1_nCD
O
SD1 Card Detect
SD1_nLED
O
SD1 LED
SD0_DAT[3:0]
IO
SD0 receive/transmit data
SD0_CMD
IO
SD0 receive response/ transmit command
SD0_CLK O
SD0
clock
General Port
GPn[147:0]
IO
General input/output ports, which are multiplexed with other function pins
(some ports are output only).
TIMMER/PWM
TOUT[3:0] O
Timer
output[3:0]
TCLK
I
External timer clock input
JTAG TEST
LOGIC
nTRST
I
nTRST (TAP Controller Reset) resets the TAP controller at start.
If debugger is used, A 10K pull-up resistor has to be connected.
If debugger (black ICE) is not used, nTRST pin must be issued by a low active
pulse (Typically connected to nRESET).
TMS
I
TMS (TAP Controller Mode Select) controls the sequence of the TAP
controller's states.
TCK
I
TCK (TAP Controller Clock) provides the clock input for the JTAG logic.
TDI
I
TDI (TAP Controller Data Input) is the serial input for test instructions and
data.
TDO
O
TDO (TAP Controller Data Output) is the serial output for test instructions and
data.