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R
Table 1-2: Virtex-4 Configuration Pins (Continued)
(1)
Pin Name
Type
HSWAPEN
Input
Notes:
1. The Bidirectional type describes a pin that is bidirectional under all conditions. If the pin is an input for some configuration modes or an
output for others, it is listed as an Input or Output type.
2. Dual-purpose pins can become user I/O after configuration. See
Setup (Steps 1-3)
While each of the configuration interfaces is different, the basic steps for configuring a
Virtex-4 device are the same for all modes.
process. Each step is described in detail in the following sections.
Device Power-Up (Step 1)
For configuration, Virtex-4 devices require power on the V
V
All JTAG and serial configuration pins are located in a separate, dedicated bank with a
dedicated V
purpose pins, and are located in Bank 2 (V
V
voltage level with the output standard set to LVCMOS_12F. In SelectMAP mode, V
must be connected to the appropriate voltage to match the I/O standard of the
configuration device.
Virtex-4 FPGA Configuration User Guide
UG071 (v1.12) June 2, 2017
Dedicated or
(2)
Dual-Purpose
Dedicated
Active High input used to disable weak pre-configuration I/O pull-up
resistors:
0 = weak pre-configuration I/O pull-up resistors enabled
1 = weak pre-configuration I/O pull-up resistors disabled
HSWAPEN must be connected to either enable or disable the pull-up
resistors.
HSWAPEN has a weak pull-up prior to and during configuration. The
weak pull-up does not always provide a reliable 1.
1
2
Clear
Device
Sample Mode
Configuration
Power-Up
Memory
Start
Figure 1-1: Virtex-4 Configuration Process
1
2
Clear
Device
Sample Mode
Configuration
Power-Up
Memory
Start
Figure 1-2: Device Power-Up (Step 1)
pins. There are no power-supply sequencing requirements.
CCINT
(V
CC_CONFIG
CCO_0
LVCMOS level. All active dedicated output pins operate at the V
CC_CONFIG
www.xilinx.com
Description
PERSIST" in Chapter 7
"
for details.
Figure 1-1
Steps
3
4
5
Device ID
Synchronization
Pins
Check
Bitstream
Steps
3
4
5
Device ID
Synchronization
Pins
Check
Bitstream
) supply. The SelectMAP data pins are shared dual-
). All dedicated input pins operate at
CCO_2
Setup (Steps 1-3)
shows the Virtex-4 configuration
6
7
Load
Configuration
CRC Check
Data
Loading
6
7
Load
Configuration
CRC Check
Data
Loading
, V
CC_CONFIG
CCAUX
CC_CONFIG
8
Startup
Sequence
Finish
ug071_01_122105
8
Startup
Sequence
Finish
ug071_02_122105
, and
CCO_2
15
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