XC4000 Configuration Template Dialog Box

Click the Configuration, Startup, Readback, Tie, or Advanced tab to access the different options within the Configuration Template dialog box. Use the different tabs of this dialog box to set the options described in this section.

Click OK to accept the template, 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.

XC4000 Configuration Tab

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

Figure 5.40 XC4000 Configuration Template Configuration Tab

Configuration Rate

The XC4000 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 1 MHz (nominal).
  
  
• Fast
  
  Select Fast to set the configuration clock rate to 8 MHz (nominal).
  
  

Threshold Levels (XC4000E and XC4000EX Only)

The Threshold Levels field contains the following options.

NOTE

These options are supported for the XC4000E and XC4000EX subfamilies only.

• Inputs
  
  Specify 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.
    
    
• Outputs
  
  Specify one of the following output options. The default is Read from Design.
  
  
  • TTL
    
    Select TTL to specify TTL-compatible output.
    
    
  • CMOS
    
    Select CMOS to specify CMOS-compatible outputs.
    
    
  • Read from Design
    
    Select Read from Design to specify the TTL/CMOS output level included in the PCF file.
    
    

Configuration Pins

The Configuration Pins field contains the following options.

• TDO
  
  The TDO pin can be used as tristatable output pin. The value of the pull-up and pull-down resistors is 50 to 100 kilohms. The following options are available. The default is Float.
  
  
  • Float
    
    Select Float to disable both the pull-up resistor and pull-down resistor on the TDO pin.
    
    
  • PullUp
    
    Select PullUp to enable a pull-up on the TDO pin.
    
    
  • PullDown
    
    Select PullDown to enable a pull-down on the TDO pin.
    
    
• M0
  
  The M0 pin is used to determine the configuration mode. The value of the pull-up and pull-down resistors is 50 to 100 kilohms. The following options are available. The default is Float.
  
  
  • Float
    
    Select Float to disable both the pull-up resistor and pull-down resistor on the M0 pin.
    
    
  • PullUp
    
    Select PullUp to enable a pull-up on the M0 pin.
    
    
  • PullDown
    
    Select PullDown to enable a pull-down on the M0 pin.
    
    
• M1
  
  The M1 pin can be used as tristatable output pin. The value of the pull-up and pull-down resistors is 50 to 100 kilohms. The following options are available. The default is Float.
  
  
  • Float
    
    Select Float to disable both the pull-up resistor and pull-down resistor on the M1 pin.
    
    
  • PullUp
    
    Select PullUp to enable a pull-up on the M1 pin.
    
    
  • PullDown
    
    Select PullDown to enable a pull-down on the M1 pin.
    
    
• M2
  
  The M2 pin is used to determine the configuration mode. The value of the pull-up and pull-down resistors is 50 to 100 kilohms. The following options are available. The default is Float.
  
  
  • Float
    
    Select Float to disable both the pull-up resistor and pull-down resistor on the M2 pin.
    
    
  • PullUp
    
    Select PullUp to enable a pull-up on the M2 pin.
    
    
  • PullDown
    
    Select PullDown to enable a pull-down on the M2 pin.
    
    
• Done
  
  The DONE pin configures an open-drain driver that requires a pull-up resistor to indicate the end of the configuration. The value of the pull-up resistor is 2 to 8 kilohms. 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 in XC4000 devices. Select this option only if you do not connect an external pull-up resistor to this 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.

XC4000 Startup Tab

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

Figure 5.41 XC4000 Configuration Template Startup Tab

The XC4000 Startup tab is identical to the tab described in the “Spartan Startup Tab” section.

XC4000 Readback Tab

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

Figure 5.42 XC4000 Configuration Template Readback Tab

The XC4000 Readback tab is identical to the tab described in the “Spartan Readback Tab” section.

XC4000 Tie Tab

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

Figure 5.43 XC4000 Configuration Template Tie Tab

The X4000 Tie tab is identical to the tab described in the “Spartan Tie Tab” section.

XC4000 Advanced Tab

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

Figure 5.44 XC4000 Configuration Template Advanced Tab

XC4000EX, XV, XL Options - Configuration Address Lines

Use the Configuration Address Lines option to set the number of address lines that will be used by the FPGA during device configuration. Address lines are used to address data from a parallel PROM or flash memory device. Select either 18 or 22. If you choose 22, four extra device pins are activated as configuration address lines. The default is 18.

This option only applies to master parallel mode configuration. For XC4000EX devices, you must set this option in addition to setting the mode pins. Refer to the Programmable Logic Data Book for more information on address lines and master parallel mode configuration.

NOTE

For XC4000XL and XC4000XV devices, the address lines are automatically set to 22 when you set the mode pins for master parallel mode configuration.