R
Platform Flash In-System Programmable Configuration PROMs
Programming
The Platform Flash PROM is a reprogrammable NOR flash
device (refer
for the program/erase specifications).
Reprogramming requires an erase followed by a program
operation. A verify operation is recommended after the
program operation to validate the correct transfer of data
from the programmer source to the Platform Flash PROM.
Several programming solutions are available.
Embedded, in-system programming reference designs,
such as
Xilinx In-System Programming Using an
Embedded Microcontroller,
are available on the Xilinx web
page for
See the
Platform Flash PROM User Guide,
for an advanced update methodology that uses the Design
Revisioning feature in the Platform Flash XCFxxP PROMs.
OE/RESET
The 1/2/4 Mbit XCFxxS Platform Flash PROMs in-system
programming algorithm results in issuance of an internal
device reset that causes OE/RESET to pulse Low.
In-System Programming
In-System Programmable PROMs can be programmed
individually, or two or more can be daisy-chained together and
programmed in-system via the standard 4-pin JTAG protocol
as shown in
In-system programming offers quick
and efficient design iterations and eliminates unnecessary
package handling or socketing of devices. The programming
data sequence is delivered to the device using either Xilinx
iMPACT software and a Xilinx download cable, a third-party
JTAG development system, a JTAG-compatible board tester,
or a simple microprocessor interface that emulates the JTAG
instruction sequence. The iMPACT software also outputs
serial vector format (SVF) files for use with any tools that
accept SVF format, including automatic test equipment.
During in-system programming, the CEO output is driven
High. All other outputs are held in a high-impedance state or
held at clamp levels during in-system programming. In-
system programming is fully supported across the
recommended operating voltage and temperature ranges.
X-Ref Target - Figure 3
External Programming
In traditional manufacturing environments, third-party device
programmers can program Platform Flash PROMs with an
initial memory image before the PROMs are assembled
onto boards. Contact a preferred third-party programmer
vendor for Platform Flash PROM support information. A
sample list of third-party programmer vendors with Platform
Flash PROM support is available on the Xilinx web page for
Pre-programmed PROMs can be assembled onto boards
using the typical soldering process guidelines in the
Device Package User Guide.
A pre-programmed PROM's
memory image can be updated after board assembly using
an in-system programming solution.
Reliability and Endurance
Xilinx in-system programmable products provide a
guaranteed endurance level of 20,000 in-system program/
erase cycles and a minimum data retention of 20 years.
Each device meets all functional, performance, and data
retention specifications within this endurance limit.
See the
Xilinx Device Reliability Report,
for device
quality, reliability, and process node information.
V
CC
GND
(a)
(b)
DS123_33_031908
Figure 3:
JTAG In-System Programming Operation
(a) Solder Device to PCB
(b) Program Using Download Cable
DS123 (v2.13.1) April 3, 2008
Product Specification
5
XILINX [ XILINX, INC ]
