Sparse Address Space Write Field Descriptions - DEC AlphaServer 8200 Technical Manual

Table 6-4

Sparse Address Space Write Field Descriptions

Field
TLSB_BANK_NUM<3:0>
TLSB_ADR<39>
TLSB_ADR<38:36>
TLSB_ADR<35:34>
TLSB_ADR<33:32>
TLSB_ADR<31:5>
TLSB_ADR<4:0>
Note that the CSR data size on the TLSB is always a hexword. Valid bits
on the second data cycle of CSR writes define which longwords of the
hexword are valid.
The I/O port transmits the correct quadword data and byte length code on
the hose to the remote I/O target node as shown in Table 6-5.
Description
Contains the TLSB commander virtual ID (VID).
Indicates the address is an I/O address space reference. It will al-
ways be one if the reference is in I/O address space.
Defines the responder TLSB node as follows:
TLSB_ADR<38:36> Node Defined
Node 4 I/O window space
0
Node 5 I/O window space
1
2 Node 6 I/O window space
Node 7 I/O window space
3
Node 8 I/O window space
4
Defines the hose number within the I/O port that is being ad-
dressed.
The Space Select field. Defines the type of PCI I/O transaction.
It is transmitted on the hose as SPC<1:0>.
TLSB_ADR<33:32>
1
2
3
This field is the byte-aligned 128-Mbyte target address. It maps
to ADR<26:0> on the remote I/O target bus. ADR<31:27> on the
remote I/O target bus is transmitted on the hose as zero.
The five least significant bits of the address bus are always zero.
Node Defined
Sparse memory space
Sparse I/O space
Sparse configuration space
I/O Port 6-19