參數(shù)資料
型號: A40MX04-PLG44A
元件分類: FPGA
英文描述: FPGA, 6000 GATES, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 21/76頁
文件大小: 429K
代理商: A40MX04-PLG44A
MX Automotive Family FPGAs
1- 2 2
v2 .0
Predictable Performance:
Tight Delay Distributions
Propagation delay between logic modules depends on
the resistive and capacitive loading of the routing tracks,
the interconnect elements, and the module inputs being
driven. Propagation delay increases as the length of
routing tracks, the number of interconnect elements, or
the number of inputs increases.
From a design perspective, the propagation delay can be
statistically
correlated
or
modeled
by
the
fanout
(number of loads) driven by a module. Higher fanout
usually requires some paths to have longer routing
tracks.
The MX FPGAs deliver a tight fanout delay distribution,
which is achieved in two ways: by decreasing the delay of
the interconnect elements and by decreasing the number
of interconnect elements per path.
Actel’s patented antifuse offers a very low resistive/
capacitive interconnect. The antifuses, fabricated in
0.45
lithography, offer nominal levels of 100
resistance and 7.0 femtofarad (fF) capacitance per
antifuse.
MX fanout distribution is also tight due to the low
number of antifuses required for each interconnect path.
The proprietary architecture limits the number of
antifuses per path to a maximum of four, with
90 percent of interconnects using only two antifuses.
Timing Characteristics
Device timing characteristics fall into three categories:
family-dependent,
device-dependent,
and
design-
dependent. The input and output buffer characteristics
are common to all MX devices. Internal routing delays
are device-dependent. Design dependency means actual
delays are not determined until after place-and-route of
the user’s design is complete. Delay values may then be
determined by using the Designer Series utility or by
performing simulation with post-layout delays.
Critical Nets and Typical Nets
Propagation delays in this data sheet apply to typical
nets. The abundant routing resources in the MX
architecture allows for deterministic timing using Actel’s
Designer Series development tools, which include TDPR,
a timing-driven place-and-route tool. Using Timer, the
designer can specify timing-critical nets and system clock
frequency. Using these timing specifications, the place-
and-route software optimizes the layout of the design to
meet the user’s specifications.
Long Tracks
Some nets in the design use long tracks, which are
special routing resources that span multiple rows,
columns, or modules. Long tracks employ three and
sometimes four antifuse connections, which increase
capacitance and resistance, resulting in longer net delays
for macros connected to long tracks. Typically, up to
6 percent of nets in a fully utilized device require long
tracks. Long tracks add approximately a 3 ns to a 6 ns
delay, which is represented statistically in higher fanout
(FO=8) routing delays in the data sheet specifications
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