Table 18

+======-========-========-========-========-========-========-========-========+
|   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
|Byte  |        |        |        |        |        |        |        |        |
|======+=======================================================================|
| 0    |                           Extended message (01h)                      |
|------+-----------------------------------------------------------------------|
| 1    |                           Extended message length (03h)               |
|------+-----------------------------------------------------------------------|
| 2    |                           SYNCHRONOUS DATA TRANSFER REQUEST code (01h)|
|------+-----------------------------------------------------------------------|
| 3    |                           Transfer period factor                      |
|------+-----------------------------------------------------------------------|
| 4    |                           REQ/ACK offset                              |
+==============================================================================+