Altera FLEX Logic Array Block Altera FLEX Carry Chain. (Example: n-bit adder). Figure from. Altera . FLEX 10K chip contains 72– LABs. ALTERA FLEX 10K SERIES CPLDs NOTES. ?id= 0B0p4VmLqkbgdaW5DalFpSldZeE0. Posted by sanju sonu at. CPLD. Each logic block is similar to a. 22V Programmable interconnect matrix. . SSTL – Stub Series-Terminate Logic Altera Flex 10K FPGA Family (cont).

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All interconnects pass 2, gates. Their fast manufacturing Every logic block also contains a flip- turnaround is an essential element of J. Summary of FPD programming technologies.

A small section of an XC routing channel appears in Figure The XC de- tical channels characterize the XC vices range in capacity from about interconnect.

FLEX 10K Device Block Diagram

Act 1, Act 2, and Act 3. Quicklogic pASIC logic cell. All FastTrack cludes cascade circuitry that allows ef- logic element within the same logic ar- horizontal seriws are identical. Applying power loads Nevertheless, we include them here be- tation.

A lookup table is a 1-bit-wide mem- F2 ory array; the memory address lines are F1 E R logic block inputs, and the 1-bit mem- VCC ory output is the lookup table output. There are also 2, to programmably interconnnect multi- special-purpose devices optimized for 1, ple SPLDs on a single chip. These fea- tures make a Mach 4 chip easier to use because they decouple sections of the 16 PAL-like block.

The figure shows only the wire seg- ments in a horizontal channel—not the vertical routing channels, CLB inputs Logic array block 8 logic elements and outputs, and the routing switches.


They have the highest speed per- ware for the following tasks: A textbook-like treatment, in- multiplexer-based logic block.

Altera Max series architecture.

FLEX 10K Device Block Diagram – SDJ

Logic capacity Figure The areas of in- numbers. Computer-Aided Design IC- ty. For inputs not involved Logic block in a product term, the appropriate EPROM transistors are programmed as permanently turned off. In com- like Actel FPGAs, its logic blocks use Inputs circuit block Output bination with the two logic gates, the multiplexers; and like Altera Flex s, arrangement of the multiplexer circuit its interconnect consists only of long enables a single logic block to realize a lines.

Actel logic blocks, based on multiplexers, are Figure In the first category, FPGA series, the XC, in about facilitate implementation of circuit Xilinx and Altera lead in number of and now offers three more generations: A macrocell is a the macrocell can feed the OR gate, gle, large device.

Xilinx also Clock has announced a new CPLD family, the Data out XC, which will offer in-circuit pro- b c grammability with 5-ns pin-to-pin delays and up to 6, logic gates.

The highest capacity general-purpose devices, CMOS dominates the IC in- Advances in technology have pro- logic chips available today are the tra- dustry, and different approaches to im- duced devices with higher capacities ditional gate arrays sometimes referred plementing programmable switches are than SPLDs.

Finite state machines are an ex- the SRAM cells with a copy of the non- cause they exemplify PLA-based rather cellent example of this class of circuits. We encourage readers in- rely on metal for conductors, with Then additional algorithms analyze the terested in more details to contact the amorphous silicon as the middle lay- resulting logic equations and fit them manufacturers or distributors for the lat- er.


June 15, Publication date: Many other SPLD products are avail- able from a wide array of companies.

It and outputs connect directly to the PIA formance. Therefore, most pro- choose from. E1 1 E2 cplsd the programmable parts to execute 3. A logic array technology that offers a cost-effective and a set of interconnect wires called a block is a complex, SPLD-like structure, solution; Max is similar to Max programmable interconnect array and so we can consider the entire chip but offers higher logic capacity PIA.

Although not shown in Figure 25, vertical wires also overlie the logic blocks, forming signal paths that span multiple rows. However, a rich selection of wire segment lengths in each channel and algorithms that guar- antee strict limits on the number of an- ViaLink Logic cell at every tifuses traversed by any two-point wire connection improve speed perfor- crossing Amorphous silicon mance significantly.


PLA structures are sometimes embedded into full-custom chips, we refer As Figure 1 shows, PALs feature only a here only seriss user-programmable PLAs provided as separate integrated cir- single level of programmability—a pro- cuits. Detailed gained rapid acceptance over the past formance and logic capacity of MPGAs, discussion of architectural trade-offs.

Figure 20 illustrates the overall Flex This design groups logic elements into in the Xilinx XC, each FastTrack wire architecture.

The V means versatile—that is, each output can be registered or combinational. Both of these de- sign in a simple hardware description a circuit.