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以LVDS设计为例学习ISE中的时序分析以及低层布局器的使用方法 在底层布局器中对LVDS管脚进行约束的方法

 P67    |                          | L45N_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P68    |                          | L45P_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P69    |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P70    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P71    |                          | L44P_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P72    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P73    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P74    |                          | L43P_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P75    |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P76    |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P77    |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P78    |                          | L42N_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P79    |                          | L42P_YY         |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P80    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P81    |                          |                 | UNUSED    | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P82    |                          | L41N            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P83    |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P84    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P85    |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P86    |                          | VREF            |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P87    |                          | LVDS_DLL_L40N   |           | LVTTL*      | 5        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P88    |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P89    | clk4x                    |                 | INPUT     | LVTTL       | 5        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P90    |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P91    |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P92    |                          |                 | UNUSED    | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P93    |                          | LVDS_DLL_L40P   |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P94    |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P95    |                          | L39P            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P96    |                          |                 | UNUSED    | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P97    |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P98    |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P99    |                          |                 | UNUSED    | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P100   |                          |                 | UNUSED    | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P101   |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P102   |                          | L36N_YY         |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P103   |                          | L36P_YY         |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P104   |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P105   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P106   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P107   |                          | L35N_YY         |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P108   |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P109   |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P110   | da                       | L34N_YY         | OUTPUT    | LVDS(34N)   | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P111   | da_x                     | VREF            | OUTPUT    | LVDS        | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P112   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P113   | ck                       | L33N_YY         | OUTPUT    | LVDS(33N)   | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P114   | ck_x                     | L33P_YY         | OUTPUT    | LVDS(33P)   | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P115   |                          | VREF            |           | LVTTL*      | 4        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P116   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P117   | db                       | L32N_YY         | OUTPUT    | LVDS(32N)   | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P118   | db_x                     | L32P_YY         | OUTPUT    | LVDS(32P)   | 4        | 12*      | SLOW*| NONE**   | ***       |         | LOCATED   |
 P119   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P120   |                          | DONE            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P121   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P122   |                          | PROGRAM         |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P123   |                          | INIT_L31N_YY    |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P124   |                          | D7_L31P_YY      |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P125   |                          | L30N            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P126   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P127   |                          |                 | UNUSED    | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P128   |                          |                 | UNUSED    | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P129   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P130   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P131   |                          |                 | UNUSED    | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P132   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P133   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P134   |                          | D6_L27P_Y       |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P135   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P136   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P137   |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P138   |                          | D5_L26N_YY      |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P139   |                          | L26P_YY         |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P140   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P141   |                          |                 | UNUSED    | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P142   |                          |                 | UNUSED    | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P143   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P144   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P145   |                          | D4_L24P_Y       |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P146   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P147   |                          | VREF            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P148   |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P149   |                          | TRDY            |           | LVTTL*      | 3        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P150   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P151   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P152   |                          | IRDY_L23N_YY    |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P153   |                          | L23P_YY         |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P154   |                          | VREF            |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P155   |                          | L22P            |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P156   |                          | D3_L21N_Y       |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P157   |                          | VREF            |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P158   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P159   |                          |                 | UNUSED    | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P160   |                          |                 | UNUSED    | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P161   |                          | VREF            |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P162   |                          | L19N_YY         |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P163   |                          | D2_L19P_YY      |           | LVTTL*      | 2        | 12*      | SLOW*| NONE**   | ***       |         |           |
 P164   |                          | VCCINT          |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       | 1.8     |           |
 P165   |                          | VCCO            |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |
 P166   |                          | GND             |           | LVTTL*      |          | 12*      | SLOW*| NONE**   | ***       |         |           |