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ATF16V8B-25PC Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATF16V8B-25PC Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 16 page  ATF16V8B Complex Mode PAL Device Emulation/PAL Replacement In the Complex Mode, combinatorial output and I/O func- tions 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: 16L8 16H8 16P8 Complex Mode Option ATF16V8B 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 perma- nently configured as combinatorial outputs. Other macro- cells can be either inputs or combinatorial outputs with pin feedback to the AND-array. Pins 1 and 11 are regular in- puts. The compiler selects this mode when all outputs are com- binatorial without OE control. The following simple PALs can be emulated using this mode: 10L8 10H8 10P8 12L6 12H6 12P6 14L4 14H4 14P4 16L2 16H2 16P2 Simple Mode Option ATF16V8B 1-15 |
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