參數(shù)資料
型號(hào)： XC4085XL-3BG560I
廠商： Xilinx Inc
文件頁(yè)數(shù)： 12/68頁(yè)
文件大小： 0K
描述： IC FPGA I-TEMP 3.3V 3SPD 560MBGA
產(chǎn)品變化通告： XC4000(XL,XLA,E) Discontinuation 15/Nov/2004
標(biāo)準(zhǔn)包裝： 12
系列： XC4000E/X
LAB/CLB數(shù)： 3136
邏輯元件/單元數(shù)： 7448
RAM 位總計(jì)： 100352
輸入/輸出數(shù)： 448
門數(shù)： 85000
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
工作溫度： -40°C ~ 100°C
封裝/外殼： 560-LBGA，金屬
供應(yīng)商設(shè)備封裝： 560-MBGA（42.5x42.5）
R
May 14, 1999 (Version 1.6)
6-7
XC4000E and XC4000X Series Field Programmable Gate Arrays
6
XC4000E and XC4000X Series
Compared to the XC4000
For readers already familiar with the XC4000 family of Xil-
inx Field Programmable Gate Arrays, the major new fea-
tures in the XC4000 Series devices are listed in this
section. The
biggest
advantages
of
XC4000E
and
XC4000X devices are signicantly increased system
speed, greater capacity, and new architectural features,
particularly Select-RAM memory.
The XC4000X devices
also offer many new routing features, including special
high-speed clock buffers that can be used to capture input
data with minimal delay.
Any XC4000E device is pinout- and bitstream-compatible
with the corresponding XC4000 device. An existing
XC4000 bitstream can be used to program an XC4000E
device. However, since the XC4000E includes many new
features, an XC4000E bitstream cannot be loaded into an
XC4000 device.
XC4000X Series devices are not bitstream-compatible with
equivalent array size devices in the XC4000 or XC4000E
families. However, equivalent array size devices, such as
the XC4025, XC4025E, XC4028EX, and XC4028XL, are
pinout-compatible.
Improvements in XC4000E and XC4000X
Increased System Speed
XC4000E and XC4000X devices can run at synchronous
system clock rates of up to 80 MHz, and internal perfor-
mance can exceed 150 MHz. This increase in performance
over the previous families stems from improvements in both
device processing and system architecture.
XC4000
Series devices use a sub-micron multi-layer metal process.
In addition, many architectural improvements have been
made, as described below.
The XC4000XL family is a high performance 3.3V family
based on 0.35
SRAM technology and supports system
speeds to 80 MHz.
PCI Compliance
XC4000 Series -2 and faster speed grades are fully PCI
compliant. XC4000E and XC4000X devices can be used to
implement a one-chip PCI solution.
Carry Logic
The speed of the carry logic chain has increased dramati-
cally. Some parameters, such as the delay on the carry
chain through a single CLB (TBYP), have improved by as
much as 50% from XC4000 values. See “Fast Carry Logic”
on page 18 for more information.
Select-RAM Memory: Edge-Triggered, Synchro-
nous RAM Modes
The RAM in any CLB can be congured for synchronous,
edge-triggered, write operation. The read operation is not
affected by this change to an edge-triggered write.
Dual-Port RAM
A separate option converts the 16x2 RAM in any CLB into a
16x1 dual-port RAM with simultaneous Read/Write.
The function generators in each CLB can be congured as
either level-sensitive (asynchronous) single-port RAM,
edge-triggered (synchronous) single-port RAM, edge-trig-
gered (synchronous) dual-port RAM, or as combinatorial
logic.
Congurable RAM Content
The RAM content can now be loaded at conguration time,
so that the RAM starts up with user-dened data.
H Function Generator
In current XC4000 Series devices, the H function generator
is more versatile than in the original XC4000. Its inputs can
come not only from the F and G function generators but
also from up to three of the four control input lines. The H
function generator can thus be totally or partially indepen-
dent of the other two function generators, increasing the
maximum capacity of the device.
IOB Clock Enable
The two ip-ops in each IOB have a common clock enable
input, which through conguration can be activated individ-
ually for the input or output ip-op or both. This clock
enable operates exactly like the EC pin on the XC4000
CLB. This new feature makes the IOBs more versatile, and
avoids the need for clock gating.
Output Drivers
The output pull-up structure defaults to a TTL-like
totem-pole. This driver is an n-channel pull-up transistor,
pulling to a voltage one transistor threshold below Vcc, just
like the XC4000 family outputs. Alternatively, XC4000
Series devices can be globally congured with CMOS out-
puts, with p-channel pull-up transistors pulling to Vcc. Also,
the congurable pull-up resistor in the XC4000 Series is a
p-channel transistor that pulls to Vcc, whereas in the origi-
nal XC4000 family it is an n-channel transistor that pulls to
a voltage one transistor threshold below Vcc.
Product Obsolete or Under Obsolescence
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