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XC4004A Datasheet

  • XC4004A

  • Logic Cell Array Family

  • 100.56KB

  • 16頁

  • XILINX   XILINX

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XC4000A
Logic Cell Array Family
Product Specifications
Features
Description
The XC4000A family of FPGAs offers four devices at the low
end of the XC4000 family complexity range. XC4000A
differs from XC4000 in four areas: fewer routing resources,
fewer wide-edge decoders, higher output sink current, and
improved output slew-rate control.
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Third Generation Field-Programmable Gate Arrays
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Abundant flip-flops
Flexible function generators
On-chip ultra-fast RAM
Dedicated high-speed carry-propagation circuit
Wide edge decoders (two per edge)
Hierarchy of interconnect lines
Internal 3-state bus capability
Eight global low-skew clock or signal distribution
network
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The XC4000 routing structure is optimized for smaller
designs, naturally requiring fewer routing resources. The
XC4000A devices have four Longlines and four single-
length lines per row and column, while the XC4000
devices have six Longlines and eight single-length lines
per row and column. This results in a smaller chip area
and lower cost per device.
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Flexible Array Architecture
鈥?Programmable logic blocks and I/O blocks
鈥?Programmable interconnects and wide decoders
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XC4000A has two wide-edge decoders on every device
edge, while the XC4000 has four. All other wide-decoder
features are identical in XC4000 and XC4000A.
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Sub-micron CMOS Process
鈥?High-speed logic and Interconnect
鈥?Low power consumption
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XC4000A outputs are specified at 24 mA, sink current,
while XC4000 outputs are specified at 12 mA. The source
current is the same 4 mA for both families.
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Systems-Oriented Features
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IEEE 1149.1-compatible boundary-scan logic support
Programmable output slew rate (4 modes)
Programmable input pull-up or pull-down resistors
24-mA sink current per output (48 per pair)
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The XC4000A family offers a more sophisticated output
slew-rate control structure with four configurable options
for each individual output driver: fast, medium fast, me-
dium slow, and slow. Slew-rate control can alleviate
ground-bounce problems when multiple outputs switch
simultaneously, and it can reduce or eliminate crosstalk
and transmission-line effects on printed circuit boards.
Note that the XC4003 and XC4005 devices are available in
both flavors, the lower-priced XC4003A/XC4005A with re-
duced routing, and the higher-priced XC4003/XC4005 with
more abundant routing resources. The XC4000A devices
are intended for less demanding and more structured
designs, and the XC4000 devices for more random designs
requiring additional routing resources.
The equivalent devices are pin-compatible and are avail-
able in identical packages, but they are not bitstream
compatible. In order to move from a XC4000A to a XC4000,
or vice versa, the design must be recompiled.
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Configured by Loading Binary File
鈥?Unlimited reprogrammability
鈥?Six programming modes
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XACT Development System runs on 鈥?86/鈥?86-type PC,
NEC PC, Apollo, Sun-4, and Hewlett-Packard 700 Series
鈥?Interfaces to popular design environments like
Viewlogic, Mentor Graphics and OrCAD
鈥?Fully automatic partitioning, placement and routing
鈥?Interactive design editor for design optimization
鈥?288 macros, 34 hard macros, RAM/ROM compiler
Table 1. The XC4000A Family of Field-Programmable Gate Arrays
Device
Appr. Gate Count
CLB Matrix
Number of CLBs
Number of Flip-Flops
Max Decode Inputs (per side)
Max RAM Bits
Number of IOBs
XC4002A
2,000
8x8
64
256
24
2,048
64
XC4003A
3,000
10 x 10
100
360
30
3,200
80
XC4004A
4,000
12 x 12
144
480
36
4,608
96
XC4005A
5,000
14 x 14
196
616
42
6,272
112
2-71

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