Answers Database M1.5i/2.1i: Prohibiting multi-purpose configuration pins. Record #5429 Product Family: Software Product Line: FPGA Implementation Product Part: Timing Analyzer Product Version: 1.5 Problem Title: M1.5i/2.1i: Prohibiting multi-purpose configuration pins. Problem Description: Urgency: Standard General Description: In order to simplify board design, user tend to prohibit multi-purpose configuration pins. What are those pins and how are they prohibited? Solution 1: There are several special purpose pins available for user IO after configuration. A majority of these pins the direct instantiation to use them. For example: TDO, MD1, etc. There are specific primitives that must be used in order utilize these pins. They can not be prohibited or pin locked. However, there are some special purpose pins that PAR can use. These pins can be prohibited in the ucf file: CONFIG PROHIBIT = P34; The following is a list of special purpose pins. It is dependent on package not on family. THIS IS FOR 4000E AND 4000X FAMILIES            PC84 PQ100 VQ100 PG120 TQ144 PG156 HDC P36 P31 P28 A13 P40 D14 LDC P37 P33 P30 C13 P44 C16 INIT P41 P39 P36 F13 P53 H15 RDY/BUSY P70 P74 P71 N3 P102 P5            TQ176 PG191 HQ208 BG225 BG256 HT144 HDC P48 E16 P58 P3 W4 P40 LDC P52 E17 P62 P4 Y4 P44 INIT P65 J16 P77 P8 W11 P53 RDY/BUSY P126 V2 P148 C15 D18 P102 PQ160 HQ160 HT176 PG223 HDC P44 P44 P48 E16 LDC P48 P48 P52 E17 INIT P59 P59 P65 J16 RDY/BUSY P114 P114 P126 V2            PQ240 HQ240 PG299 HQ304 BG352 PG411 HDC P64 P64 C19 P225 AD23 C37 LDC P68 P68 C20 P221 AE23 G35 INIT P89 P89 K19 P192 AF14 W37 RDY/BUSY P174 P174 V5 P85 G4 AW7            PG559 PQ208 PG475 BG432 BG560 HDC C41 P58 G35 AH27 AK29 LDC K36 P62 C41 AH26 AJ27 INIT AA39 P77 Y38 AK16 AJ17 RDY/BUSY AW9 P148 AY6 F2 G4 THIS IS FOR VIRTEX            PQ240 HQ240 BG256 BG352 BG432 BG560 INIT P123 P123 U18 AD2 AJ2 AH5 BUSY/DOUT P178 P178 D18 E4 D3 D4 End of Record #5429 - Last Modified: 07/13/99 15:22

For the latest news, design tips, and patch information on the Xilinx design environment, check out the Technical Tips!