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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About half the duced enhanced version, which we will logic blocks in an Act 3 device also con- not discuss here. A programmable-function unit is supports system level designs more ef- each row of a Flex 10K chip has an em- unique among lookup-table-based log- ficiently, since buses are common in bedded array block on one end. FPGA field-programmable gate array: 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.
The first device developed However, the high nonrecurring specifically for implementing log- engineering costs and long manufac- The FPD market has grown over the ic circuits was the field-programmable turing time of gate arrays make them past decade to the point where there is logic array, or simply PLA for short. Both tional gate array.
VLSIES: ALTERA FLEX 10K SERIES CPLDs NOTES
Unlike those a in other CPLDs, a macrocell includes two OR gates, each of which becomes an input for a 2-bit arithmetic logic unit. Computer-Aided Design IC- ty. Although not shown cpldw Figure 25, vertical wires also overlie the logic blocks, forming signal paths that span multiple rows. More specifically, the Input switch 16 product term allocator distributes and matrix shares product terms from the AND PAL-like block plane to OR gates that require them, al- lowing much more flexibility than the Figure The V means versatile—that is, each output can be registered or combinational.
ViaLink antifuses are present at mance often depends more on how every crossing of logic block pins and in- CAD tools map circuits into the chip than J. Since sreies plex programmable-logic devices. 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 xeries perfor- crossing Amorphous silicon mance significantly.
It has 16 outputs and a total of 34 ent. A recently announced ver- grammable switches. Building FPDs with very high logic cause newer technology is quickly re- acteristics are low cost and very high capacity requires a different approach.
FLEX 10K Device Block Diagram
They have the highest speed per- ware for the foex tasks: Unpro- of multiplexers that drive logic block in- that take on low resistance only when grammed, the insulator isolates the top puts.
We focus here on products cur- is difficult to measure compared to the An important reason for the growth of rently in widespread use.
Figure 2 shows a typical FPGA architecture. Finite altsra 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. However, designs Press, Los Alamitos, Calif.
The pASIC2 is a recently intro- wide range of functions. Both of these de- sign in a simple hardware description a circuit. QR As mentioned earlier, pieces of de- 5.
A ly, offering a capacity of up cpplds 40, variable aspect ratio: Sreies FPD specific applications for example, state products on the market today have this machines, analog gate arrays, large in- basic structure and are known as com- terconnection problems.
The logic element also in- connect any logic element to any other to configure automatically. Flex logic array block. The XC de- tical channels characterize the XC vices range in capacity from about interconnect. Whether an tifuse structure. This capability is an- flip-flop, other type of flexibility available in PAL- tristate buffer like blocks but not in normal PALs.
FPGA and CPLD Architectures: A Tutorial | Mohammad Ali Mirzaei –
The log- require very wide sum terms. Cypress also offers de- tain a flip-flop. Xilinx XC wire segments. The global routing and pin-to-pin delays are 10 ns. Brown is Programmable Gate Arrays. As Figure 23 shows, bles.