![](http://datasheet.mmic.net.cn/240000/A54SX16-CQ256B_datasheet_15643070/A54SX16-CQ256B_34.png)
54SX Family FPGAs RadTolerant and HiRel
34
v2.0
List of Changes
The following table lists critical changes that were made in the current version of the document.
Data Sheet Categories
In order to provide the latest information to designers, some data sheets are published before data has been fully
characterized. These data sheets are marked as
“
Advanced
”
or Preliminary
”
data sheets. The definition of these categories
are as follows:
Advanced
The data sheet contains initial estimated information based on simulation, other products, devices, or speed grades. This
information can be used as estimates, but not for production.
Preliminary
The data sheet contains information based on simulation and/or initial characterization. The information is believed to be
correct, but changes are possible.
Unmarked (production)
The data sheet contains information that is considered to be final.
Previous version
Changes in current version (Preliminary v 1.5.1 (web-only))
Page
Preliminary v1.5
Power up and down sequencing information was modified: damage to the device is
possible when 3.3V is powered up first and when 5.0V is powered down first.
The last line of equation 2 was cut off in the previous version. It has been replaced in
the existing version.
The User I/Os changed.
The following sections are new or were updated:
Clock Resources
,
Performance
,
I/O Modules
,
Power Requirements
,
Boundary Scan Testing (BST)
, and
Configuring
Diagnostic Pins
,
TRST pin
,
Dedicated Test Mode
, and
Flexible Mode
,
Development Tool Support
,
RT54SX Probe Circuit Control Pins
, and
Design
Considerations
.
The
“
Pin Description
”
on page 26
has been updated.
Note that the
“
Package Characteristics and Mechanical Drawings
”
section has been
eliminated from the data sheet. The mechanical drawings are now contained in a
separate document,
“
Package Characteristics and Mechanical Drawings,
”
available
on the Actel web site.
13
14
Preliminary v1.5.2
1, 2, 3
8-10
26