
I/O PORTS
S3C3410X RISC MICROPROCESSOR
7-12
PORT 3 CONTROL REGISTERS (PCON3, PUR3)
Register
Offset
Address
R/W
Description
Reset
Value
PCON3
0xb016
R/W
Configuration the pins of port 3
0x0
PUR3
0xb02b
R/W
pull-up disable resister for port 3
0xff
PCON3
Bit
Description
Initial State
P3.0
[1:0]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Write byte enable(nWBE0) output for external interface or
Data Mask(DQM0) output for SDRAM or Byte enable(nBE0)
output for x16 SRAM. If the memory bank is configured as
SDRAM bank, this port will behavior as Data Mask(DQM0). If the
memory bank is configured as x16 SRAM bank, this port will
behavior as Byte enable(nBE0). Otherwise, this port will
behavior as nWBE0.
00
P3.1
[3:2]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Write byte enable(nWBE1) output for external interface or
Data Mask(DQM1) output for SDRAM or Byte enable(nBE0)
output for x16 SRAM. If the memory bank is configured as
SDRAM bank, this port will behavior as Data Mask(DQM1). If the
memory bank is configured as x16 SRAM bank, this port will
behavior as Byte enable(nBE0). Otherwise, this port will
behavior as nWBE1.
00
P3.2
[5:4]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Column address strobe(nCAS0) output for DRAM or Row
address strobe(nSRAS) output for SDRAM. If the memory bank
is configured as EDO DRAM. This port will behavior as nCAS0.
If the memory bank is configured as SDRAM bank, this port will
behavior as nSRAS.
00
P3.3
[7:6]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Column address strobe(nCAS1) output for DRAM or Row
address strobe(nSCAS) output for SDRAM. This port will
behavior as nCAS1. If the memory bank is configured as
SDRAM bank, this port will behavior as nSRAS.
00
P3.4
[9:8]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Write enable(nWE) output for 16-bit SRAM or SDRAM
00
P3.5
[11:10]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Clock Enable(SCKE) output for SDRAM
00
P3.6
[13:12]
00 = C-MOS input mode
01 = C-MOS push-pull output mode
10 = Clock output for SDRAM
00
P3.7
[15:14]
00 = C-MOS input mode or external interrupt(EINT2) mode
01 = C-MOS push-pull output mode
10 = Extra chip select(nECS1) output
00