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) |
+=============================================================================+