PSD4000 Series
Preliminary Information
52
The
PSD4000
Functional
Blocks
(cont.)
9.4.5 Ports A, B and C – Functionality and Structure
Ports A and B have similar functionality and structure, as shown in Figure 21. The two
ports can be configured to perform one or more of the following functions:
J
MCU I/O Mode
J
GPLD Output
–
Combinatorial PLD outputs.
J
PLD Input
–
Input to the PLDs.
J
Address In
–
Additional high address inputs may be latched by ALE.
J
Open Drain/Slew Rate
–
pins PC[7:0]can be configured to fast slew rate,
pins PA[7:0] and PB[7:0] can be configured to Open Drain
Mode.
I
DATA OUT
REG.
D
Q
D
Q
WR
WR
READ MUX
GPLD OUTPUT
P
D
B
PLD INPUT
DIR REG.
DATA IN
OUTPUT
SELECT
OUTPUT
MUX
PORT PIN
DATA OUT
Figure 21. Port A, B and C