Dense Address Space Transactions; Sparse Address Write Length Encoding - DEC AlphaServer 8200 Technical Manual

Table 6-5

Sparse Address Write Length Encoding

NOTE: The byte-length code is transmitted on the hose as LEN<1:0>. The Length
field is equivalent to TLSB_ADR<4:3> for sparse address space reads.

6.4.3 Dense Address Space Transactions

The TLSB protocol is the same for dense address space reads and dense
address space writes. Figure 6-7 illustrates the TLSB address bus protocol
for dense address space reads and writes.
Figure 6-7

Dense Address Space Transactions

TLSB_BANK_NUM
<3:0>
3 2 1 0
VID
TLSB
Virtual ID
(VID) of
Commander Node
Table 6-6 describes the dense address space read/write protocol.
6-20 I/O Port
Valid Bits Length
<6,4,2,0> <1:0>
0001 00
01
001X
10
01XX
11
1XXX
39 38 37 36 35 34 33 32 31 30 29 28 27
1
TLSB Quadword Transmit on Hose
63–0 (QW 0)
127–64 (QW 1)
191–128 (QW 2)
192–255 (QW 3)
TLSB_ADR<39:0>
26 25 24 23 22 21 20 19 18 17 16 15 14 13
Byte-Aligned I/O Address
<31:0> Byte-Aligned I/O Address
<33:32> Space Select Field
01 = Sparse memory space
10 = Sparse I/O space
11 = Sparse configuration space
<35:34> Hose number in port being
addressed (0 - 3)
<38:36> TLSB Responder Node
0 - 4 Nodes 4 - 8 I/O window space, resp.
<39> I/O Select (always 1 for CSR transaction)
12 11 10 9 8 7 6 5 4 3 2 1 0
0
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