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PDF EPM7256AE Data sheet ( Hoja de datos )

Número de pieza EPM7256AE
Descripción Programmable Logic Device
Fabricantes Altera Corporation 
Logotipo Altera Corporation Logotipo



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October 2002, ver. 4.3
Includes
® MAX 7000AE
MAX 7000A
Programmable Logic
Device
Data Sheet
Features...
f
High-performance 3.3-V EEPROM-based programmable logic
devices (PLDs) built on second-generation Multiple Array MatriX
(MAX®) architecture (see Table 1)
3.3-V in-system programmability (ISP) through the built-in
IEEE Std. 1149.1 Joint Test Action Group (JTAG) interface with
advanced pin-locking capability
– MAX 7000AE device in-system programmability (ISP) circuitry
compliant with IEEE Std. 1532
– EPM7128A and EPM7256A device ISP circuitry compatible with
IEEE Std. 1532
Built-in boundary-scan test (BST) circuitry compliant with
IEEE Std. 1149.1
Supports JEDEC Jam Standard Test and Programming Language
(STAPL) JESD-71
Enhanced ISP features
– Enhanced ISP algorithm for faster programming (excluding
EPM7128A and EPM7256A devices)
– ISP_Done bit to ensure complete programming (excluding
EPM7128A and EPM7256A devices)
– Pull-up resistor on I/O pins during in-system programming
Pin-compatible with the popular 5.0-V MAX 7000S devices
High-density PLDs ranging from 600 to 10,000 usable gates
Extended temperature range
For information on in-system programmable 5.0-V MAX 7000 or 2.5-V
MAX 7000B devices, see the MAX 7000 Programmable Logic Device Family
Data Sheet or the MAX 7000B Programmable Logic Device Family Data Sheet.
Altera Corporation
DS-M7000A-4.3
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EPM7256AE pdf
MAX 7000A Programmable Logic Device Data Sheet
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MAX 7000A devices use CMOS EEPROM cells to implement logic
functions. The user-configurable MAX 7000A architecture accommodates
a variety of independent combinatorial and sequential logic functions.
The devices can be reprogrammed for quick and efficient iterations
during design development and debug cycles, and can be programmed
and erased up to 100 times.
MAX 7000A devices contain from 32 to 512 macrocells that are combined
into groups of 16 macrocells, called logic array blocks (LABs). Each
macrocell has a programmable-AND/fixed-OR array and a configurable
register with independently programmable clock, clock enable, clear, and
preset functions. To build complex logic functions, each macrocell can be
supplemented with both shareable expander product terms and high-
speed parallel expander product terms, providing up to 32 product terms
per macrocell.
MAX 7000A devices provide programmable speed/power optimization.
Speed-critical portions of a design can run at high speed/full power,
while the remaining portions run at reduced speed/low power. This
speed/power optimization feature enables the designer to configure one
or more macrocells to operate at 50% or lower power while adding only a
nominal timing delay. MAX 7000A devices also provide an option that
reduces the slew rate of the output buffers, minimizing noise transients
when non-speed-critical signals are switching. The output drivers of all
MAX 7000A devices can be set for 2.5 V or 3.3 V, and all input pins are
2.5-V, 3.3-V, and 5.0-V tolerant, allowing MAX 7000A devices to be used
in mixed-voltage systems.
MAX 7000A devices are supported by Altera development systems,
which are integrated packages that offer schematic, text—including
VHDL, Verilog HDL, and the Altera Hardware Description Language
(AHDL)—and waveform design entry, compilation and logic synthesis,
simulation and timing analysis, and device programming. The software
provides EDIF 2 0 0 and 3 0 0, LPM, VHDL, Verilog HDL, and other
interfaces for additional design entry and simulation support from other
industry-standard PC- and UNIX-workstation-based EDA tools. The
software runs on Windows-based PCs, as well as Sun SPARCstation, and
HP 9000 Series 700/800 workstations.
For more information on development tools, see the MAX+PLUS II
Programmable Logic Development System & Software Data Sheet and the
Quartus Programmable Logic Development System & Software Data Sheet.
Altera Corporation
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EPM7256AE arduino
MAX 7000A Programmable Logic Device Data Sheet
Parallel Expanders
Parallel expanders are unused product terms that can be allocated to a
neighboring macrocell to implement fast, complex logic functions.
Parallel expanders allow up to 20 product terms to directly feed the
macrocell OR logic, with five product terms provided by the macrocell and
15 parallel expanders provided by neighboring macrocells in the LAB.
The compiler can allocate up to three sets of up to five parallel expanders
to the macrocells that require additional product terms. Each set of five
parallel expanders incurs a small, incremental timing delay (tPEXP). For
example, if a macrocell requires 14 product terms, the compiler uses the
five dedicated product terms within the macrocell and allocates two sets
of parallel expanders; the first set includes five product terms, and the
second set includes four product terms, increasing the total delay by
2 × tPEXP.
Two groups of eight macrocells within each LAB (e.g., macrocells 1
through 8 and 9 through 16) form two chains to lend or borrow parallel
expanders. A macrocell borrows parallel expanders from lower-
numbered macrocells. For example, macrocell 8 can borrow parallel
expanders from macrocell 7, from macrocells 7 and 6, or from macrocells
7, 6, and 5. Within each group of eight, the lowest-numbered macrocell
can only lend parallel expanders, and the highest-numbered macrocell
can only borrow them. Figure 4 shows how parallel expanders can be
borrowed from a neighboring macrocell.
Altera Corporation
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