DS026 (v4.1) December 15, 2003 www.xilinx.com 1
Product Specification 1-800-255-7778
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Features
• In-system programmable 3.3V PROMs for
configuration of Xilinx FPGAs
- Endurance of 20,000 program/erase cycles
- Program/erase over full commercial/industrial
voltage and temperature range (–40°C to +85°C)
• IEEE Std 1149.1 boundary-scan (JTAG) support
• Simple interface to the FPGA
• Cascadable for storing longer or multiple bitstreams
• Low-power advanced CMOS FLASH process
• Dual configuration modes
- Serial Slow/Fast configuration (up to 33 MHz)
- Parallel (up to 264 Mb/s at 33 MHz)
• 5V tolerant I/O pins accept 5V, 3.3V and 2.5V signals
• 3.3V or 2.5V output capability
• Available in PC20, SO20, PC44, and VQ44 packages
• Design support using the Xilinx Alliance and
Foundation series software packages.
• JTAG command initiation of standard FPGA
configuration
Description
Xilinx introduces the XC18V00 series of in-system program-
mable configuration PROMs (Figure 1). Devices in this 3.3V
family include a 4-megabit, a 2-megabit, a 1-megabit, and a
512-kilobit PROM that provide an easy-to-use, cost-effec-
tive method for re-programming and storing Xilinx FPGA
configuration bitstreams.
When the FPGA is in Master Serial mode, it generates a
configuration clock that drives the PROM. A short access
time after CE
and OE are enabled, data is available on the
PROM DATA (D0) pin that is connected to the FPGA D
IN
pin. New data is available a short access time after each ris-
ing clock edge. The FPGA generates the appropriate num-
ber of clock pulses to complete the configuration. When the
FPGA is in Slave Serial mode, the PROM and the FPGA
are clocked by an external clock.
When the FPGA is in Master-SelectMAP mode, the FPGA
generates a configuration clock that drives the PROM.
When the FPGA is in Slave-Parallel or Slave-SelectMAP
Mode, an external oscillator generates the configuration
clock that drives the PROM and the FPGA. After CE
and
OE are enabled, data is available on the PROMs DATA
(D0-D7) pins. New data is available a short access time
after each rising clock edge. The data is clocked into the
FPGA on the following rising edge of the CCLK. A free-run-
ning oscillator can be used in the Slave-Parallel or
Slave-SelecMAP modes.
Multiple devices can be concatenated by using the CEO
output to drive the CE input of the following device. The
clock inputs and the DATA outputs of all PROMs in this
chain are interconnected. All devices are compatible and
can be cascaded with other members of the family or with
the XC17V00 one-time programmable Serial PROM family.
0
XC18V00 Series In-System
Programmable Configuration
PROMs
DS026 (v4.1) December 15, 2003
00
Product Specification
R
Figure 1: XC18V00 Series Block Diagram
Control
and
JTAG
Interface
Memory
Serial
or
Parallel
Interface
D0 DATA
Serial or Parallel Mode
D[1:7]
Parallel Interface
Data
Address
CLK
CE
TCK
TMS
TDI
TDO
OE/Reset
CEO
Data
DS026_01_090502
7
CF
