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Port 4 dedicated output control register
Register symbol: P4SS
Address:
x'36008048
Purpose:
Along with P4MD, this register selects the content output on the port 4 pins.
Bit No.
7
6
Bit name
-
-
P45S P44S P43S
Reset
0
0
Access
R
R
R/W R/W R/W
P45M; P45S
00: Serial 1 data input/output (SBO1)
* The input/output setting is made through the serial interface 1 settings.
01: DRAM write signal output [for 2CAS] (DWE)
1x: General-purpose input/output port (P45)
P44M; P44S
00: Serial 1 data input (SBI1)
01: DRAM CAS signal 1 output [for 2CAS] (DCAS1)
1x: General-purpose input/output port (P44)
P43M; P43S
00: Serial 1 transfer clock input/output (SBT1)
* The input/output setting is made through the serial interface 1 settings.
01: DRAM CAS signal 0 output [for 2CAS] (DCAS0)
1x: General-purpose input/output port (P43)
P42M
0: Serial 0 data input/output (SBO0)
* The input/output setting is made through the serial interface 0 settings.
1: General-purpose input/output port (P42)
P41M
0: Serial 0 data input (SBI0)
1: General-purpose input/output port (P41)
P40M
0: Serial 1 transfer clock input/output (SBT0)
* The input/output setting is made through the serial interface 0 settings.
1: General-purpose input/output port (P40)
Note: If DWE, DCAS1, and DCAS0 are selected in the P4MD and P4SS registers, each of these control signals is
output, regardless of the value of P4DIR. The input/output settings for this general-purpose port are made
through the P4DIR register.
5
4
3
2
-
0
0
0
0
R
R
1
0
-
-
0
0
R
I/O Ports
15-27
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