参数资料
型号: XC18V04VQ44C
厂商: Xilinx Inc
文件页数: 21/24页
文件大小: 0K
描述: IC PROM SRL FOR 4M GATE 44-VQFP
标准包装: 160
可编程类型: 系统内可编程
存储容量: 4Mb
电源电压: 3 V ~ 3.6 V
工作温度: 0°C ~ 70°C
封装/外壳: 44-TQFP
供应商设备封装: 44-VQFP(10x10)
包装: 托盘
其它名称: 122-1280
XC18V04VQ44C-ND
XC18V00 Series In-System-Programmable Configuration PROMs
DS026 (v5.2) January 11, 2008
Product Specification
6
R
In-System Programming
In-System Programmable PROMs can be programmed
individually, or two or more can be chained together and
programmed in-system via the standard 4-pin JTAG
protocol as shown in Figure 2. In-system programming
offers quick and efficient design iterations and eliminates
unnecessary package handling or socketing of devices. The
Xilinx development system provides the programming data
sequence using either Xilinx iMPACT software and a
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 and with
automatic test equipment.
All outputs are held in a high-Z state or held at clamp levels
during in-system programming.
OE/RESET
The ISP programming algorithm requires issuance of a
reset that causes OE to go Low.
External Programming
Xilinx reprogrammable PROMs can also be programmed by
a third-party device programmer, providing the added
flexibility of using pre-programmed devices with an in-
system programmable option for future enhancements and
design changes.
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 UG116, Xilinx Device Reliability Report, for device
quality, reliability, and process node information.
Design Security
The Xilinx in-system programmable PROM devices
incorporate advanced data security features to fully protect
the programming data against unauthorized reading via
JTAG. Table 3 shows the security setting available.
The read security bit can be set by the user to prevent the
internal programming pattern from being read or copied via
JTAG. When set, it allows device erase. Erasing the entire
device is the only way to reset the read security bit.
Table 3: Data Security Options
Reset
Set
Read Allowed
Program/Erase Allowed
Verify Allowed
Read Inhibited via JTAG
Program/Erase Allowed
Verify Inhibited
X-Ref Target - Figure 2
Figure 2: In-System Programming Operation (a) Solder Device to PCB and (b) Program Using Download Cable
DS026_02_06/1103
GND
V CCINT
(a)
(b)
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