Table 279

+=====-========-========-========-========-========-========-========-========+ 
|  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    | 
|Byte |        |        |        |        |        |        |        |        | 
|=====+=======================================================================| 
| 0   | (MSB)                                                                 | 
|-----+---                                                                 ---| 
| 1   |                           Data buffer status length                   | 
|-----+---                                                                 ---| 
| 2   |                                                                 (LSB) | 
|-----+-----------------------------------------------------------------------| 
| 3   |                           Reserved                           |  Block | 
|=====+=======================================================================| 
|     |                           Data buffer status descriptor(s)            | 
|=====+=======================================================================| 
| 0   |                           Window identifier                           | 
|-----+-----------------------------------------------------------------------| 
| 1   |                           Reserved                                    | 
|-----+-----------------------------------------------------------------------| 
| 2   | (MSB)                                                                 | 
|-----+---                                                                 ---| 
| 3   |                           Available data buffer                       | 
|-----+---                                                                 ---| 
| 4   |                                                                 (LSB) | 
|-----+-----------------------------------------------------------------------| 
| 5   | (MSB)                                                                 | 
|-----+---                                                                 ---| 
| 6   |                           Filled data buffer                          | 
|-----+---                                                                 ---| 
| 7   |                                                                 (LSB) | 
+=============================================================================+