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ATF1508ASVL-20QC160 Datasheet(PDF) 5 Page - ATMEL Corporation |
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ATF1508ASVL-20QC160 Datasheet(HTML) 5 Page - ATMEL Corporation |
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5 / 22 page  ATF1508ASV(L) 5 Figure 1. ATF1508ASV(L) Macrocell Output Select and Enable The ATF1508ASV(L) macrocell output can be selected as registered or combinatorial. The buried feedback signal can be either combinatorial or registered signal regardless of whether the output is combinatorial or registered. The output enable multiplexer (MOE) controls the output enable signals. Any buffer can be permanently enabled for simple output operation. Buffers can also be permanently disabled to allow use of the pin as an input. In this configu- ration. all the macrocell resources are still available, including the buried feedback, expander and CASCADE logic. The output enable for each macrocell can be selected as one of the global OUTPUT enable signals. The device has six global OE signals. Global Bus/Switch Matrix The global bus contains all input and I/O pin signals as well as the buried feedback signal from all 128 macrocells. The switch matrix in each logic block receives as its inputs all signals from the global bus. Under software control, up to 40 of these signals can be selected as inputs to the logic block. Foldback Bus Each macrocell also generates a foldback product term. This signal goes to the regional bus and is available to 16 macrocells. The foldback is an inverse polarity of one of the macrocell’s product terms. The 16 foldback terms in each region allow generation of high fan-in sum terms (up to 21 product terms) with little additional delay. Open-collector Output Option This option enables the device output to provide control signals such as an interrupt that can be asserted by any of the several devices. |
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Similar Description - ATF1508ASVL-20QC160 |
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