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Spartan-6 FPGA Configuration User Guide www.xilinx.com 71
UG380 (v2.7) October 29, 2014
Chapter 5
Configuration Details
Configuration Pins
Certain pins are dedicated to configuration (Table 5-1), while others are dual-purpose
(Table 5-3). Dual-purpose pins serve both as configuration pins and as user I/Os after
configuration. Dedicated configuration pins retain their function after configuration.
Configuration constraints can be selected when generating the Spartan®-6 device
bitstream. Certain configuration operations can be affected by these constraints. For a
description of the available constraints, see the software constraints guide.
Table 5-1: Spartan-6 FPGA Dedicated Configuration Pins
Pin Name Type
(1)
Description
DONE Bidirectional,
Open-Drain,
or Active
Active High signal with programmable pull-up indicating configuration is complete.
0 = FPGA not configured
1 = FPGA configured
Refer to the BitGen section of UG628
, Command Line Tools User Guide,
for software settings
.
PROGRAM_B
(2, 3)
Input Active Low signal with programmable pull-up, asynchronous full-chip reset.
TDI Input Test Data In. This pin is the serial input to all JTAG instruction and data registers.
The state of the TAP controller and the current instruction determine the register that
is fed by the TDI pin for a specific operation. TDI has an internal resistive pull-up to
provide a logic High to the system if the pin is not driven. TDI is applied into the
JTAG registers on the rising edge of TCK.
TDO
Output Test Data Out. This pin is the serial output for all JTAG instruction and data registers.
The state of the TAP controller and the current instruction determine the register
(instruction or data) that feeds TDO for a specific operation. TDO changes state on
the falling edge of TCK and is only active during the shifting of instructions or data
through the device. TDO is an active driver output.
TMS
Input Test Mode Select. This pin determines the sequence of states through the JTAG TAP
controller on the rising edge of TCK. TMS has an internal resistive pull-up to provide
a logic High if the pin is not driven.
TCK
Input Test Clock. This pin is the JTAG Test Clock. TCK sequences the TAP controller and
the JTAG registers.
SUSPEND
(3)
Input Suspend Mode. Used to put the FPGA into suspend mode.
The SUSPEND pin should be Low during power up and configuration. If the
Suspend feature is not used, the SUSPEND pin must be connected to ground.
V
FS
Input Voltage source for eFUSE programming.
(4)
V
BATT
Input Battery supply voltage for AES encryption key storage in SRAM.
(4)
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