9/ N/C is No-Connect pin, it is not connected to circuitry within the device, and can be driven to any voltage or be left floating
with no effect on the operation of the device.
10/ I/O Customizations: By utilizing manufacturer’s Designer software (see 6.7 herein), the following I/O features can be
customized:
Bank-Wide Programmable Input Delays: A five-bit programmable input delay element is associated with each I/O. The
value of this delay is set on a bank-wide basis. It is optional for each input buffer within the bank (i.e. the user can enable or
disable the delay element for the I/O). The default setting for this property can be set in Manufacturer’s Designer software.
When the input buffer drives a register within the I/O, the delay element is activated by default to ensure a zero hold-time.
When the input buffer does not drive a register, the delay element is deactivated to provide higher performance.
Slew-Rate and Drive Strength for LVTTL Output Buffer: By using Manufacturer’s Designer software, the slew-rate value for
the LVTTL output buffer can be programmed and can be set to either slow or fast. The drive strength value for LVTTL
output buffer can also be programmed to four different drive strength values (8mA, 12mA, 16mA, or 24mA).
Other I/O types and features: Differential I/O standards, voltage-referenced I/O standards, Double Data Rate (DDR),
access to I/O registers, using weak pull-up and pull-down resistors can be instantiated through using I/O macros in
manufacturer’s Designer software.
FIGURE 2. Terminal connections – Continued.
SIZE
STANDARD
5962-04221
A
MICROCIRCUIT DRAWING
DEFENSE SUPPLY CENTER COLUMBUS
COLUMBUS, OHIO 43218-3990
REVISION LEVEL
SHEET
C
43
DSCC FORM 2234
APR 97
ACTEL [ Actel Corporation ]
