Example 3: Posted Byte Write Request
The Host Bridge in Figure 7-5 on page 157 is targeting I/O address space in Device 2 (UnitID2) with a posted, sized (byte) write of three bytes.
Figure 7-5. Posted WrSized (Byte) Write Targeting A Downstream Device
Example 3: WrSized (Byte) Request Packet Setup
(Refer to  in Figure 7-5 on page 157)
Command[5:0] Field (Byte 0, Bit 5:0)
This is the sized write (WrSized) control packet command code. The option bits within this field: the posted (bit 5), dword (bit 2), Isoc (Bit 1), and coherency (bit 0) are all (cleared = 0), meaning the request is non-posted, uses byte data size, travels in the standard virtual ...