UPSD3254 STMICROELECTRONICS [STMicroelectronics], UPSD3254 Datasheet - Page 134

• Manufacturer Part Number: UPSD3254
• Description: Flash Programmable System Devices with 8032 Microcontroller Core
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
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
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PT1
PT2
POLARITY
POLARITY
BIT
BIT
ENABLE (.OE)
ENABLE (.OE)
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 68.)
ECS1
ECS2
DIRECTION
DIRECTION
REGISTER
REGISTER
PD1 PIN
PD2 PIN
AI06607