XC3S250E Xilinx, Inc., XC3S250E Datasheet - Page 101

• Manufacturer Part Number: XC3S250E
• Description: Spartan-3E FPGA Family
• Manufacturer: Xilinx, Inc.

Functional Description
Table 57: Spartan-3E FPGA Bitstream Generator (BitGen) Options (Continued)
94
TdoPin
TmsPin
UserID
Security
CRC
Persist
Option Name
Pins/Function
reconfiguration
JTAG TDO pin
JTAG TMS pin
JTAG User ID
interface pins,
Configuration
Configuration
Slave mode,
SelectMAP,
SelectMAP
Readback,
BPI mode,
Affected
register
Partial
JTAG,
Pulldown
Pulldown
( default )
Pullnone
Pullnone
Disable
Values
Enable
Pullup
Pullup
Level1
string
None
Level
User
Yes
No
Internally connects a pull-up resistor between JTAG TDO pin and VCCAUX.
Internally connects a pull-down resistor between JTAG TDO pin and GND.
No internal pull-up resistor on JTAG TDO pin.
Internally connects a pull-up resistor between JTAG TMS pin and VCCAUX.
Internally connects a pull-down resistor between JTAG TMS pin and GND.
No internal pull-up resistor on JTAG TMS pin.
The 32-bit JTAG User ID register value is loaded during configuration. The default
value is all ones, 0xFFFF_FFFF hexadecimal. To specify another value, enter an
8-character hexadecimal value.
Readback and partial reconfiguration are available via the JTAG port or via the
SelectMAP interface, if the Persist option is set to Yes.
Readback function is disabled. Partial reconfiguration is still available via the JTAG port
or via the SelectMAP interface, if the Persist option is set to Yes.
Readback function is disabled. Partial reconfiguration is disabled.
Default. Enable CRC checking on the FPGA bitstream. If error detected, FPGA
asserts INIT_B Low and DONE pin stays Low.
Turn off CRC checking.
All BPI and Slave mode configuration pins are available as user-I/O after configuration.
This option is required for Readback and partial reconfiguration using the SelectMAP
interface. The SelectMAP interface pins (see
reserved after configuration and are not available as user-I/O.
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Description
Slave Parallel Mode, page
Advance Product Specification
DS312-2 (v1.1) March 21, 2005
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