Cell Array. XC4005A Datasheet
® XC4000, XC4000A, XC4000H
Logic Cell Array Families
• Third Generation Field-Programmable Gate Arrays
– Abundant flip-flops
– Flexible function generators
– On-chip ultra-fast RAM
The XC4000 families of Field-Programmable Gate Arrays
(FPGAs) provide the benefits of custom CMOS VLSI, while
avoiding the initial cost, time delay, and inherent risk of a
conventional masked gate array.
– Dedicated high-speed carry-propagation circuit
– Wide edge decoders
The XC4000 families provide a regular, flexible, program-
mable architecture of Configurable Logic Blocks (CLBs),
– Hierarchy of interconnect lines
interconnected by a powerful hierarchy of versatile routing
– Internal 3-state bus capability
resources, and surrounded by a perimeter of program-
– Eight global low-skew clock or signal distribution
mable Input/Output Blocks (IOBs).
• Flexible Array Architecture
XC4000-family devices have generous routing resources to
accommodate the most complex interconnect patterns.
– Programmable logic blocks and I/O blocks
XC4000A devices have reduced sets of routing resources,
– Programmable interconnects and wide decoders
sufficient for their smaller size. XC4000H high I/O devices
• Sub-micron CMOS Process
– High-speed logic and Interconnect
maintain the same routing resources and CLB structure as
the XC4000 family, while nearly doubling the available I/O.
– Low power consumption
The devices are customized by loading configuration data
• Systems-Oriented Features
– IEEE 1149.1-compatible boundary-scan logic support
– Programmable output slew rate
– Programmable input pull-up or pull-down resistors
into the internal memory cells. The FPGA can either actively
read its configuration data out of external serial or byte-
parallel PROM (master modes), or the configuration data
can be written into the FPGA (slave and peripheral modes).
– 12-mA sink current per output (XC4000 family)
The XC4000 families are supported by powerful and so-
– 24-mA sink current per output (XC4000A and
phisticated software, covering every aspect of design: from
schematic entry, to simulation, to automatic block place-
• Configured by Loading Binary File
– Unlimited reprogrammability
ment and routing of interconnects, and finally the creation
of the configuration bit stream.
– Six programming modes
Since Xilinx FPGAs can be reprogrammed an unlimited
• XACT Development System runs on ’386/’486-type PC,
NEC PC, Apollo, Sun-4, and Hewlett-Packard 700
– Interfaces to popular design environments like
Viewlogic, Mentor Graphics and OrCAD
– Fully automatic partitioning, placement and routing
number of times, they can be used in innovative designs
where hardware is changed dynamically, or where hard-
ware must be adapted to different user applications. FPGAs
are ideal for shortening the design and development cycle,
but they also offer a cost-effective solution for production
rates well beyond 1000 systems per month.
– Interactive design editor for design optimization
– 288 macros, 34 hard macros, RAM/ROM compiler
Table 1. The XC4000 Families of Field-Programmable Gate Arrays
XC4002A 4003/3A 4003H 4004A 4005/5A 4005H 4006 4008 4010/10D 4013/13D 4020 4025
Appr. Gate Count
Number of CLBs
Number of Flip-Flops
Max Decode Inputs
Max RAM Bits
Number of IOBs
10 x 10
10 x 10
12 x 12
14 x 14
14 x 14 16 x 16
18 x 18
20 x 20
24 x 24
28 x 28
32 x 32
3,200 3,200 4,608 6,272 6,272 8,192 10,368 12,800* 18,432* 25,088 32,768
80 160 96 112 192 128 144 160 192 224 256
*XC4010D and XC4013D have no RAM
XC4000, XC4000A, XC4000H Logic Cell Array Families
XC4000 Compared to XC3000A
For those readers already familiar with the XC3000A
family of Xilinx Field Programmable Gate Arrays, here is a
concise list of the major new features in the XC4000 family.
CLB has two independent 4-input function generators.
A third function generator combines the outputs of the
two other function generators with a ninth input.
All function inputs are swappable, all have full access;
none are mutually exclusive.
CLB has very fast arithmetic carry capability.
CLB function generator look-up table can also be used as
CLB flip-flops have asynchronous set or reset.
CLB has four outputs, two flip-flops, two combinatorial.
CLB connections symmetrically located on all four edges.
IOB has more versatile clocking polarity options.
IOB has programmable input set-up time:
long to avoid potential hold time problems,
short to improve performance.
IOB has Longline access through its own TBUF.
Outputs are n-channel only, lower VOH increases speed.
XC4000 outputs can be paired to double sink current to
24 mA. XC4000A and XC4000H outputs can each
sink 24 mA, can be paired for 48 mA sink current.
IEEE 1149.1- type boundary scan is supported in the I/O.
Wide decoders on all four edges of the LCA device.
Increased number of interconnect resources.
All CLB inputs and outputs have access to most inter-
Switch Matrices are simplified to increase speed.
Eight global nets can be used for clocking or distributing
TBUF output configuration is more versatile and 3-state
control less confined.
Program is single-function input pin,overrides everything.
INIT pin also acts as Configuration Error output.
Peripheral Synchronous Mode (8 bit) has been added.
Peripheral Asynchronous Mode has improved hand-
Start-up can be synchronized to any user clock (this is a
No Powerdown, but instead a Global 3-state input that
does not reset any flip-flops.
No on-chip crystal oscillator amplifier.
Configuration Bit Stream includes CRC error checking.
Configuration Clock can be increased to >8 MHz.
Configuration Clock is fully static, no constraint on the
maximum Low time.
Readback either ignores flip-flop content (avoids need for
masking) or it takes a snapshot of all flip-flops at the
start of Readback.
Readback has same polarity as Configuration and can be
Table 2. Three Generations of Xilinx Field-Programmable Gate Array Families
Number of flip-flops
Max number of user I/O
Max number of RAM bits
Function generators per CLB
Number of logic inputs per CLB
Number of logic outputs per CLB
Number of low-skew global nets
Fast carry logic
Internal 3-state drivers
Output slew-rate control
Crystal oscillator circuit