Dense Window Read Command Packet Description - DEC AlphaServer 8200 Technical Manual

Table 6-21 Dense Window Read Command Packet Description
Field Description
Are always zero.
Clock 1, <31:30>
Virtual ID of the TLSB commanding node. The VID indicates which CPU
Clock 1, <29:26>
is requesting the data. The VID is returned on the Up Hose in all window
return data/status packets so that the I/O port can target the requesting
commanding node with the data or status of the transaction.
Are always zero.
Clock 1, <25:15>
Indicates read/write: 0 is read, 1 is write. For this packet bit <14> is al-
Clock 1, <14>
ways zero.
Command field. The field value is 11 for all window command packets.
Clock 1, <13:12>
Are always zero.
Clock 1, <11:2>
SPC<1:0> field. The space field indicates which PCI address space is in
Clock 1, <1:0>
use as follows:
SPC<1:0>
00
01
10
11
Byte-aligned address for the targeted remote I/O adapter.
Clock 2, <31:0>
PCI Address Space
Dense memory space
Sparse memory space (not used with this packet)
Sparse I/O space (not used with this packet)
Sparse configuration space (not used with this packet)
I/O Port 6-49