參數(shù)資料
型號: A54SX72A-FG256AX79
元件分類: FPGA
英文描述: FPGA, 4024 CLBS, 72000 GATES, PBGA256
封裝: 1 MM PITCH, PLASTIC, FBGA-256
文件頁數(shù): 17/68頁
文件大?。?/td> 498K
代理商: A54SX72A-FG256AX79
1- 20
v2.2
Cell Timing Characteristics
Timing Characteristics
Timing characteristics for SX-A devices fall into three
categories: family-dependent, device-dependent, and
design-dependent.
The
input
and
output
buffer
characteristics are common to all SX-A family members.
Internal routing delays are device-dependent. Design
dependency means actual delays are not determined
until after placement and routing of the user’s design are
complete. Delay values may then be determined by using
the Timer utility or performing simulation with post-
layout delays.
Critical Nets and Typical Nets
Propagation delays are expressed only for typical nets,
which are used for initial design performance evaluation.
Critical net delays can then be applied to the most timing
critical paths. Critical nets are determined by net
property assignment prior to placement and routing. Up
to 6 percent of the nets in a design may be designated as
critical, while 90 percent of the nets in a design are
typical.
Long Tracks
Some nets in the design use long tracks. Long tracks are
special routing resources that span multiple rows,
columns, or modules.
Long tracks employ three to five
antifuse connections. This increases 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 contribute approximately 4 ns to 8.4 ns delay. This
additional delay is represented statistically in higher
fanout routing delays.
Timing Derating
SX-A devices are manufactured with a CMOS process.
Therefore, device performance varies according to
temperature, voltage, and process changes. Minimum
timing parameters reflect maximum operating voltage,
minimum
operating
temperature,
and
best-case
processing.
Maximum
timing
parameters
reflect
minimum
operating
voltage,
maximum
operating
temperature, and worst-case processing.
Figure 1-18 Cell Timing Characteristics
(Positive Edge-Triggered)
D
CLK
CLR
PRESET
Q
t
HPWH
t
RPWH
t
HD
SUD
t
HPWL
t
RPWL
t
CLR
RCO
D
CLK
Q
CLR
PRESET
t
WASYN
t
HP
t
PRESET
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