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ATF20V8B-15SI Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATF20V8B-15SI Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 22 page  ATF20V8B(Q)(L) 9 ATF20V8B Complex Mode PAL Device Emulation/PAL Replacement. In the complex Mode, combinatorial output and I/O functions are possible. Pins 1 and 11 are regular inputs to the array. Pins 13 through 18 have pin feedback paths back to the AND-array, which makes full I/O capability possible. Pins 12 and 19 (outermost macrocells) are outputs only. They do not have input capability. In this mode, each macrocell has seven product terms going to the sum term and one product term enabling the output. Combinatorial applications with an OE requirement will make the compiler select this mode. The following devices can be emulated using this mode: 20L8 20H8 20P8 Complex Mode Operation ATF20V8B Simple Mode PAL Device Emulation/PAL Replacement. In the Simple Mode, 8 product terms are allocated to the sum term. Pins 15 and 16 (center macrocells) are permanently configured as combinatorial outputs. Other macrocells can be either inputs or combinatorial outputs with pin feedback to the AND-array. Pins 1 and 11 are regular inputs. The compiler selects this mode when all outputs are combi- natorial without OE control. The following simple PALs can be emulated using this mode: 14L8 14H8 14P8 16L6 18H6 16P6 18L4 18H4 18P4 20L2 20H2 20P2 Simple Mode Option |
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