Description
The ATF1508ASV(L) is a high-performance, high-density complex programmable logic
device (CPLD) that utilizes Atmel’s proven electrically-erasable technology. With 128
logic macrocells and up to 100 inputs, it easily integrates logic from several TTL, SSI,
MSI, LSI and classic PLDs. The ATF1508ASV(L)’s enhanced routing switch matrices
increase usable gate count and increase odds of successful pin-locked design
modifications.
The ATF1508ASV(L) has up to 96 bi-directional I/O pins and four dedicated input pins,
depending on the type of device package selected. Each dedicated pin can also serve
as a global control signal, register clock, register reset or output enable. Each of these
control signals can be selected for use individually within each macrocell.
Each of the 128 macrocells generates a buried feedback that goes to the global bus.
Each input and I/O pin also feeds into the global bus. The switch matrix in each logic
block then selects 40 individual signals from the global bus. Each macrocell also gener-
ates a foldback logic term that goes to a regional bus. Cascade logic between
macrocells in the ATF1508ASV(L) allows fast, efficient generation of complex logic func-
tions. The ATF1508ASV(L) contains eight such logic chains, each capable of creating
sum term logic with a fan-in of up to 40 product terms.
The ATF1508ASV(L) macrocell, shown in Figure 1, is flexible enough to support highly-
complex logic functions operating at high-speed. The macrocell consists of five sections:
product terms and product term select multiplexer, OR/XOR/CASCADE logic, a flip-flop,
output select and enable, and logic array inputs.
Unused macrocells are automatically disabled by the compiler to decrease power con-
sumption. A security fuse, when programmed, protects the contents of the
ATF1508ASV(L). Two bytes (16 bits) of User Signature are accessible to the user for
purposes such as storing project name, part number, revision or date. The User Signa-
ture is accessible regardless of the state of the security fuse.
The ATF1508ASV(L) device is an in-system programmable (ISP) device. It uses the
industry-standard 4-pin JTAG interface (IEEE Std. 1149.1), and is fully-compliant with
JTAG’s Boundary-scan Description Language (BSDL). ISP allows the device to be pro-
grammed without removing it from the printed circuit board. In addition to simplifying the
manufacturing flow, ISP also allows design modifications to be made in the field via
software.
Product Terms and Select
Mux
Each ATF1508ASV(L) macrocell has five product terms. Each product term receives as
its inputs all signals from both the global bus and regional bus.
The product term select multiplexer (PTMUX) allocates the five product terms as
needed to the macrocell logic gates and control signals. The PTMUX programming is
determined by the design compiler, which selects the optimum macrocell configuration.
OR/XOR/CASCADE Logic
The ATF1508ASV(L)’s logic structure is designed to efficiently support all types of logic.
Within a single macrocell, all the product terms can be routed to the OR gate, creating a
5-input AND/OR sum term. With the addition of the CASIN from neighboring macrocells,
this can be expanded to as many as 40 product terms with little additional delay.
The macrocell’s XOR gate allows efficient implementation of compare and arithmetic
functions. One input to the XOR comes from the OR sum term. The other XOR input can
be a product term or a fixed high- or low-level. For combinatorial outputs, the fixed level
input allows polarity selection. For registered functions, the fixed levels allow DeMorgan
minimization of product terms. The XOR gate is also used to emulate T- and JK-type
flip-flops.
4
ATF1508ASV(L)
1408H–PLD–7/05
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