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Figure 6-19
Sparse Window Write Command Packet
Clock cycle
31 30 29
0 0
VID
1
2
3
4
Table 6-20 gives the description of the Sparse Window Write Command
packet.
Dense Window Read Command Packet
The Dense Window Read Command packet is used by processors to read
memory space in adapters on remote I/O buses that support direct I/O
window space.
The data for a Dense Window Read Command packet is returned to the I/O
port on the Up Hose through a Dense Window Read Data Return packet.
Figure 6-20 shows the Dense Window Read Command packet.
Dense Window Write Command Packet
The Dense Window Write Command packet is used by processors to write
memory space in adapters on remote I/O buses that support direct I/O
window space.
A Dense Window Write Command packet must be acknowledged by a Win-
dow Write Status Return packet to the I/O port on the Up Hose. Figure
6-21 shows the Dense Window Write Command packet.
DND <31:0>
26 25
Zero
Byte Aligned Address <31:0>
Data Longword 0
Data Longword 1
15 14 13 12 11
1
1 1
Zero
0
4
3
2
1
LEN
SPC
BXB-0570-94
I/O Port 6-47
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