It has 12 inputs and a dedicated clock input.

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Presentation transcript:

It has 12 inputs and a dedicated clock input. EP1210 EP1200 is a 40-pin device. It has 12 inputs and a dedicated clock input. It also has 24 I/O pins each of which can be programmed as inputs or outputs. One I/O pin can also be used as a second clock input line. It is partitioned into 2 symmetrical segments, each segment containing 14 macrocells. Each segment is further divided into 4 blocks.

EP1210 Block Diagram

Both block1 and block2 contain 4 macrocells, and has 6 product terms. EP1210 Both block1 and block2 contain 4 macrocells, and has 6 product terms. Block3 also has 4 macrocells, has and 8 products. Besides 2 of the macrocells share 4 product terms and other 2 share another set of 4 product terms. Block 4 contains 2 macrocells each of which forms the sum of 8 product terms. The two segments in EP1200 communicate over a series of buses. Within each segment, 8 out of the 14 macrocells transmit their true and complemented outputs on a 16-bit local bus and also transfer their outputs to their respective I/O pins.

Global communication is done via a 48 bus. EP1210 Global communication is done via a 48 bus. It carries the true and complement values of the 12 dedicated inputs, and outputs of the 4 macrocells in block 3 of each segment. Each EP1210 macrocell contains an AND-OR structure and programmable I/O block. The AND array can be programmed to generate 4 to 16 product terms. These product terms are ORed together and may be fed back to the other macrocells or to itself or via D flip flop.

EP1210 Macrocell

EP1210 Macrocell Alternatively the output at I/O pin is fed back to the AND array or via D flip flop. EP1210 contains 2 internal paths which are used to distribute clock and latch enable signals. One path drives the enable inputs of the latches associated with I/O and dedicated input latches. The other path provides clock signals to the D flip flops of the macrocells. It has 3 EPROM cells to select one of 8 operating modes of the clock signals.

EP1210 Clock Signal Modes