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	Added doc for ws2812b_phy
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							| @ -13,7 +13,45 @@ For directories containing VHDL source files, the directory name denotes the VHD | ||||
| ### ws2812b_phy | ||||
| Low level driver for the WorldSemi WS2812B RGB LEDs. Handles bit timing and command separation.  | ||||
| 
 | ||||
| *Documentation coming soon* | ||||
| <pre> | ||||
|                                         +    + | ||||
|                                         |    | | ||||
|                                         |    | | ||||
| +-----------+    +----------------------v----v------+ | ||||
| |           +----> pixData_red[7:0]    clk  rst     | | ||||
| |           |    |                                  | | ||||
| |           +----> pixData_green[7:0]               | | ||||
| |           |    |                                  |    +----+ | ||||
| |   User    +----> pixData_blue[7:0]             so +---->LEDs| | ||||
| |   Logic   |    |                                  |    +----+ | ||||
| |           |    |                                  | | ||||
| |           +----> pixData_valid                    | | ||||
| |           |    |                                  | | ||||
| |           <----+ pixData_next                     | | ||||
| +-----------+    +----------------------------------+ | ||||
| 
 | ||||
|         _   _   _   _   _   _         _   _   _   _         _   _   _   _ | ||||
| clk   _/ \_/ \_/ \_/ \_/ \_/ \_   / /  \_/ \_/ \_/ \_   / /  \_/ \_/ \_/ \_ | ||||
|                 _______ _______  / /  _______          / / | ||||
| data  ---------<_______X_______ |  |  _______>------- | |   ---------------- | ||||
|                 _______________ \  \  _______          \ \ | ||||
| valid _________/                 \  \        \_______   \ \ ________________ | ||||
|                     ___          |  |     ___           | |      ___ | ||||
| next  _____________/   \_______  /  / ___/   \_______   / / ____/   \_______ | ||||
|                                 /  /                   / / | ||||
|                1   2   3                 4   5                  6 | ||||
| 
 | ||||
| 1: User applies first LED's data and asserts pixData_valid. | ||||
| 2: PHY acknowledges that it latched the data and starts supplying the | ||||
|    information to the LED string. | ||||
| 3: User logic sees the pixData_next strobe and prepares the next data. | ||||
| 4: Next data is latched. Steps 3 and 4 are to be repeated until each LED in | ||||
|    the string has been given a value. | ||||
| 5: User logic sees the pixData_next strobe. As all LEDs have already been | ||||
|    given a value, pixData_valid is deasserted to signal the end of a string. | ||||
| 6: The completion of the reset time is signalled using another | ||||
|    pixData_next strobe. | ||||
| </pre> | ||||
| 
 | ||||
| For an example, see Rainbow. | ||||
| 
 | ||||
|  | ||||
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