Specifications

I/O Port 6-63
Figure 6-31 Dense Window Read Data Return Packet
Table 6-34 gives the description of the dense window read data return
packet.
Table 6-34 Dense Window Read Data Return Packet Description
31 30 29 28 27 26 25 10 9 05
0 E VID Zero Count Zero
BXB-0787-94
30
1101
UPCTL
1*

2

3

4

5

6

7

8

9
* = clock cycle
6
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
Data Longword 0
Data Longword 1
Data Longword 2
Data Longword 3
Data Longword 4
Data Longword 5
Data Longword 6
Data Longword 7
UPD <31:0>
Field Description
Clock 1, <31>
Is always zero.
Clock 1, <30>
Error. Set by the remote I/O bus adapter if any errors were detected on
the transfer.
Clock 1, <29:26>
Virtual ID of the TLSB commander node. This enables the I/O port to as-
sociate the packet with the originating commander node of the transac-
tion. This field is the same as the VID field in the Down Hose Dense Win-
dow Read Command packet being acknowledged.
Clock 1, <25:10>
Are always zero.
Clock 1, <9:6>
Count field. Used by the I/O port to obtain the maximum number of win-
dow transactions the remote I/O bus adapter is capable of queueing. The
value in this field should always be the same for a specific remote bus I/O
adapter. The I/O port keeps track of the number of buffers that have been
filled.
NOTE: The I/O port sets the value of its remote adapter node buffer count
field to one at power-up or system initialization. The I/O port sets its re-
mote adapter node buffer count field to the value in this count field upon
receiving a Dense Window Read Data Return packet.
Clock 1, <5:0>
Are always zero.
Clocks 2 through
9, <31:0>
Bits <31:0> are return data longword 0 through 7, respectively, of the
dense read.