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參數(shù)資料
| 型號： | XC17V04SERIES |
| 英文描述： | XC17V00 Series Configuration PROM |
| 中文描述： | XC17V00系列配置PROM |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 157K |
| 代理商： | XC17V04SERIES |
XC17V00 Series Configuration PROM
DS073 (v1.5) October 9, 2001
Advance Product Specification
1-800-255-7778FPGA Master Serial Mode Summary
The I/O and logic functions of the Configurable Logic Block
(CLB) and their associated interconnections are established
by a configuration program. The program is loaded either
automatically upon power up, or on command, depending
on the state of the three FPGA mode pins. In Master Serial
mode, the FPGA automatically loads the configuration pro-
gram from an external memory. The Xilinx PROMs have
been designed for compatibility with the Master Serial
mode.
Upon power-up or reconfiguration, an FPGA enters the
Master Serial mode whenever all three of the FPGA
mode-select pins are Low (M0=0, M1=0, M2=0). Data is
read from the PROM sequentially on a single data line. Syn-
chronization is provided by the rising edge of the temporary
signal CCLK, which is generated during configuration.
Master Serial Mode provides a simple configuration inter-
face. Only a serial data line, two control lines, and a clock
line are required to configure an FPGA. Data from the
PROM is read sequentially, accessed via the internal
address and bit counters which are incremented on every
valid rising edge of CCLK.
If the user-programmable, dual-function DIN pin on the
FPGA is used only for configuration, it must still be held at a
defined level during normal operation. The Xilinx FPGA
families take care of this automatically with an on-chip
default pull-up/down resistor or keeper circuit.
Cascading Configuration PROMs
For multiple FPGAs configured as a daisy-chain, or for
future FPGAs requiring larger configuration memories, cas-
caded PROMs provide additional memory. After the last bit
from the first PROM is read, the next clock signal to the
PROM asserts its CEO output Low and disables its DATA
line. The second PROM recognizes the Low level on its CE
input and enables its DATA output. See
Figure 3
.
After configuration is complete, the address counters of all
cascaded PROMs are reset if the FPGA PROGRAM pin
goes Low, assuming the PROM reset polarity option has
been inverted.
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