Clocking-FMC.md

-The main purpose of the Clocking FMC is to test/prototype the clocking circuit proposed in the [WRS-4 main board (Hardware_Architecture)](/project/wr-switch-hw-v4/wikis/uploads/c4fa8bc97eeeb551c736146eae7b8e25/WRS-4_main_board_Hardware_Architecture_-v1.7-2020-06-09.pdf) document, section 3.4 (page 25-28). Additionally, the FMC has an SFP cage and it can be used to enable WR on a host board, such as e.g. AFCZ, or ZCU102/ZCU106 eval board.
+The main purpose of the Clocking FMC is to test/prototype the clocking circuit proposed in the [WRS-4 main board (Hardware_Architecture)](/project/wr-switch-hw-v4/wikis/uploads/c4fa8bc97eeeb551c736146eae7b8e25/WRS-4_main_board_Hardware_Architecture_-v1.7-2020-06-09.pdf), section 3.4 (page 25-28). Additionally, the FMC has an SFP cage and it can be used to enable WR on a host board, such as e.g. AFCZ, or ZCU102/ZCU106 eval board.
+
 
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 ## Reviews
 
 |         | Date   |  Design files | Issue label for comments | Comments | Status |
@@ -8,6 +8,13 @@ The main purpose of the Clocking FMC is to test/prototype the clocking circuit p
 | 1       |2020-07 | schematics ([pdf](uploads/bafa3fcbd86ebd5de2fa91d144da2822/BRD-FCWR-01_V1_0.pdf) [rar](uploads/90c900bc35779996b8cac789f44ef3c0/BRD-FCWR-01.rar)) | clockingFMC-review-1 |  [see issues](https://ohwr.org/project/wr-switch-hw-v4/issues?label_name%5B%5D=ClockingFMC-review-1)         | Completed |  
 | 2       |2020-09 | schematics ([pdf](uploads/92dc142454ae0bb79289e66ae3117b70/BRD-FCWR-01_V1_0-draft-d.pdf)), [BOM](uploads/bca58e7aabc4ee310ee86e532f5c3ea6/BRD-FCWR-01_Part_List_V1_0.xls) | clockingFMC-review-2|          | Ongoing       | 
 
+NOTE: It is a prototype not intenend to be
+
+
+
+## Description of the clocking circuit
+
+*extract from [WRS-4 main board (Hardware_Architecture)](/project/wr-switch-hw-v4/wikis/uploads/c4fa8bc97eeeb551c736146eae7b8e25/WRS-4_main_board_Hardware_Architecture_-v1.7-2020-06-09.pdf)*
 
 ![Clocknig-FMC](uploads/390fb3b388a9eb267784c456c471ca64/Clocknig-FMC.png)