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I/O Ports
15-7
Fig. 15-2-2 Port 0 Block Diagram (P01, P00)
15.2.2 Register Descriptions
Port 0 is a general-purpose output port that is also used for address bus A [22:20], DRAM CAS signal CAS.
Each register for port 0 is described below.
Port 0 output register
Register symbol: P0OUT
Address: x'36008000
Purpose: This register sets the data to be output on port 0.
Bit No.76543210
Bit name - - - - - P02O P01O P00O
Reset 0 0 0 0 0 0 0 0
Access R R R R R R/W R/W R/W
Internal data bus
P0n
(n=1,0)
P0OUT
P0nO
P... Represents one bit of each register.
M
P
X
A21(n=1),
P0nMD
P0MD
A23 to A16
Output enable signals
A20(n=0)