uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
External Chip Select
The CPLD also provides two External Chip Select
(ECS1-ECS2) outputs on Port D pins that can be
used to select external devices. Each External
Chip Select (ECS1-ECS2) consists of one product
Figure 68. Port D External Chip Select Signals
term that can be configured active High or Low.
The output enable of the pin is controlled by either
the output enable product term or the Direction
Register. (See Figure
ENABLE (.OE)
DIRECTION
REGISTER
PT1
ECS1
POLARITY
BIT
PD1 PIN
CPLD AND ARRAY
PLD INPUT BUS
ENABLE (.OE)
DIRECTION
REGISTER
PT2
ECS2
PD2 PIN
POLARITY
BIT
AI06607
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