XC5200 Configuration Options

Click the Configuration, Startup, Readback, or Tie tab to access the different options within the Configuration Options dialog box. These options affect the Configure step in the implementation flow. Use the different tabs of this dialog box to set the options described in the following sections.

• “XC5200 Configuration Tab”
  
  
• “XC5200 Startup Tab”
  
  
• “XC5200 Readback Tab”
  
  
• “XC5200 Tie Tab”
  
  

Click OK to accept the options, click Cancel to exit the dialog box without changing any settings, click Default to set the default options, or click Help to obtain online help.

XC5200 Configuration Tab

Use this tab, shown in the following figure, to set the following options.

Figure 5.61 XC5200 Configuration Tab

Configuration Rate

The XC5200 uses an internal configuration clock, CCLK, when configuring in a master mode. The configuration rate option allows you to select the rate for this clock. The following options are available. The default is Slow.

• Slow
  
  Select Slow to set the configuration clock rate to 0.75 MHz (nominal).
  
  
• Medium
  
  Select Medium to set the configuration clock rate to 6 MHz (nominal).
  
  
• Fast
  
  Select Fast to set the configuration clock rate to 12 MHz (nominal).
  
  

Threshold Level - Inputs

Select one of the following input options. The default is Read from Design.

• TTL
  
  Select TTL to specify TTL-compatible inputs.
  
  
• CMOS
  
  Select CMOS to specify CMOS-compatible inputs.
  
  
• Read from Design
  
  Select Read from Design to specify the TTL/CMOS input level included in the physical contraints (PCF) file.
  
  

Configuration Pins

The Configuration Pins group box contains the following options.

• Done
  
  The DONE pin configures an open-drain driver that requires a pull-up resistor to indicate the end of the configuration. The following options are available. The default is PullUp.
  
  
  • Float
    
    Select Float to disable the pull-up resistor on the DONE pin. If you select this option, be sure you have connected an external pull-up resistor to this pin.
    
    
  • PullUp
    
    Select PullUp to enable an internal pull-up resistor on the DONE pin. This resistor has a value of 2 to 8 kilohms. Select this option only if you do not connect an external pull-up resistor to this pin.
    
    
• Program
  
  The !PROG pin allows device reprogramming. The value of the pull-up resistor is 50 to 100 kilohms. The following options are available. The default is PullUp.
  
  
  • Float
    
    Select Float to disable the pull-up resistor on the !PROG pin.
    
    
  • PullUp
    
    Select PullUp to enable an internal pull-up resistor on the !PROG pin.
    
    

Perform CRC During Configuration

This option enables Cyclic Redundancy Checking (CRC) error checking during configuration. If enabled, the software calculates a running CRC and inserts a unique four-bit partial check at the end of each data frame in the configuration bitstream. This allows the device to perform a CRC check on the bitstream during the configuration process. If disabled, the device performs a simple check for the 0110 pattern at the end of each frame in the configuration data. By default, this option is on.

Produce ASCII Configuration File

This option creates a rawbits (RBT) file in addition to the binary BIT file. The RBT file is a text file that contains ASCII 1s and 0s. These characters represent the actual bits in the configuration bitstream that are downloaded to the FPGA. By default, this option is off.

Oscillator Clock

This option determines whether the XC5200 oscillator will be driven by the internal clock or by a user clock. The default is CCLK.

• CCLK
  
  Select CCLK to drive the oscillator with the internal 16 MHz clock.
  
  
• User Clock
  
  Select User Clock to drive the oscillator with a user clock. If you specify User Clock, the clock must be connected to the OSC.CK pin of the device's OSC component.
  
  

XC5200 Startup Tab

Use this tab, shown in the following figure, to set the configuration startup options.

Figure 5.62 XC5200 Startup Tab

The XC5200 Startup tab is identical to the tab described in the “Spartan Startup Tab” section.

XC5200 Readback Tab

Use this tab, shown in the following figure, to set the configuration readback options.

Figure 5.63 XC5200 Readback Tab

The XC5200 Readback tab is identical to the tab described in the “Spartan Readback Tab” section.

XC5200 Tie Tab

Use this tab, shown in the following figure, to set the tie options.

Figure 5.64 XC5200 Tie Tab

The XC5200 Tie tab is identical to the tab described in the “Spartan Tie Tab” section.