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Limitations are The number of inputs (n) The number of outputs (m) The number of product terms (p) 5.3 Combinational PLDs ReturnNext Programmable Logic Arrays Historically, the first PLDs were programmable logic arrays (PLAs). A PLA is a combinational, two-level AND-OR device that can be programmed to realize any sum-of products logic expression, subject to the size limitations of the device.

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I1 I2 I3 I4 O1 P1P2P3P4P5P6 O2 O3

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5.3 Combinational PLDs NextBackReturn Programmable Array Logic Device I1 I2 I3 O1 IO1 PAL16L8 (P341)

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Other programmable devices will be introduced in Section 8.3. There are six bidirectional pins that may be used as inputs or outputs or both. 5.3 Combinational PLDs BackReturn Differences between the PAL16L8 and a PLA The PAL16L8 devices has a fixed OR array. AND-gate output cannot shared. Each output of the PAL16L8 has an individual three-state output enabled. There is an inverter between the output of each OR gate and the external pin of the device.

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