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Each unused I/O pin on MAX 7000A devices may be used as an additional ground pin. In EPM7128A and EPM7256A devices, utilizing unused I/O pins as additional ground pins requires using the associated macrocell.

In MAX 7000AE devices, this programmable ground feature does not require the use of the associated macrocell; therefore, the buried macrocell is still available for user logic for pld epm7256atc eeprom memory content decryption.

The output buffer for each MAX 7000A I/O pin has an adjustable output slew rate that can be configured for low-noise or high-speed performance. A faster slew rate provides high-speed transitions for high-performance systems.

However, these fast transitions may introduce noise transients into the system. A slow slew rate reduces system noise, but adds a nominal delay of 4 to 5 ns. When the configuration cell is turned off, the slew rate is set for low-noise performance for the sake of breaking cpld epm7064lc68 memory protection.

Each I/O pin has an individual EEPROM bit that controls the slew rate, allowing designers to specify the slew rate on a pin-by-pin basis. The slew rate control affects both the rising and falling edges of the output signal.