QL82SD datasheet(42/60 Pages) ETC1

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QL82SD Device Data Sheet Rev C

Preliminary

Figure 51: QuickSD I/O Cell

The bi-directional I/O pin options can be programmed for input, output, or bi-directional

operation. Each bi-directional I/O pin is associated with an I/O cell which features an

input/feedback register, an input buffer, output/feedback register, three-state output buffer,

an output enable register, and two 2-to-1 multiplexers.

For input functions, I/O pins can provide combinatorial registered data or both options

simultaneously to the logic array. For combinatorial input operation, data is routed from I/O

pins through the input buffer to the array logic. For registered input operation, I/O pins drive

the D input of input cell registers, allowing data to be captured with fast set-up times without

consuming internal logic cell resources.

For output functions, I/O pins can receive combinatorial or registered data from the logic

array. For combinatorial output operation, data is routed from the logic array through a

multiplexer to the I/O pin. For registered output operation, the array logic drives the D input

of the output cell register which in turn drives the I/O pin through a multiplexer. The

multiplexer allows either a combinatorial or a registered signal to be driven to the I/O pin.

The three-state output buffer controls the flow of data from the array logic to the I/O pin and

allows the I/O pin to act as an input and/or output. The buffer's output enable can be

individually controlled by a logic cell array or any pin (through the regular routing resources),

or bank-controlled through one of the global networks.

The signal can also be either combinatorial or registered. This is identical to that of the flow

for the output cell. For combinatorial control operation, data is routed from the logic array

through a multiplexer to the three-state control. For registered control operation, the array

logic drives the D input of the OE cell register which in turn drives the three-state control

through a multiplexer. The multiplexer allows either a combinatorial or a registered signal to

be driven to the three-state control.

For output functions, I/O pins can be individually configured for active HIGH, active LOW,

or open-drain inverting operation. In the active HIGH and active LOW modes, the pins of

all devices are fully 3.3 V compliant.

PAD

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