Attr[3:0]# (I/O); Bclkp/Bclkn (I); Be[7:0]# (I/O); Address Space Size - Intel Itanium 2 Processor Datasheet
2 processor 1.66 ghz with 9 mb l3 cache / 1.66 ghz with 6 mb l3 cache / 1.6 ghz with 9 mb l3 cache / 1.6 ghz with 6 mb l3 cache/ 1.5 ghz with 6 mb l3 cache / 1.5 ghz with 4 mb l3 cache / 1.4 ghz with 4 mb l3 cache / 1.3 ghz with 3 mb l3 cache / 1.0 ghz wi
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Signals Reference
Table A-1. Address Space Size
ASZ[1:0]#
0
0
1
1
Any memory access transaction addressing a memory region that is less than 64 GB (that is,
Aa[49:36]# are all zeroes) must set ASZ[1:0]# to 01. Any memory access transaction addressing a
memory region that is equal to or greater than 64 GB (that is, Aa[49:36]# are not all zeroes) must
set ASZ[1:0]# to 10. All observing bus agents that support the 64 GByte (36-bit) address space
must respond to the transaction when ASZ[1:0]# equals 01. All observing bus agents that support
larger than the 64 GByte (36-bit) address space must respond to the transaction when ASZ[1:0]#
equals 01 or 10.
A.1.6
ATTR[3:0]# (I/O)
The ATTR[3:0]# signals are the attribute signals. They are driven by the request initiator during the
second clock of the Request Phase on the Ab[35:32]# pins. The ATTR[3:0]# signals are valid for
all transactions. The ATTR[3]# signal is reserved. The ATTR[2:0]# are driven based on the
memory type. Please refer to
Table A-2. Effective Memory Type Signal Encoding
A.1.7
BCLKp/BCLKn (I)
The BCLKp and BCLKn differential clock signals determine the bus frequency. All agents drive
their outputs and latch their inputs on the differential crossing of BCLKp and BCLKn on the
signals that are using the common clock latched protocol.
BCLKp and BCLKn indirectly determine the internal clock frequency of the Itanium 2 processor.
Each Itanium 2 processor derives its internal clock by multiplying the BCLKp and BCLKn
frequency by a ratio that is defined and allowed by the power-on configuration.
A.1.8
BE[7:0]# (I/O)
The BE[7:0]# signals are the byte-enable signals for partial transactions. They are driven by the
request initiator during the second Request Phase clock on the Ab[15:8]# pins.
92
Memory Address
Space
0
Reserved
1
36-bit
0
50-bit
1
Reserved
Table
A-2.
ATTR[2:0]#
000
100
101
110
111
Memory Access
Range
Reserved
0 to (64 GByte - 1)
64 GByte to
(1 Pbyte –1)
Reserved
Description
Uncacheable
Write Coalescing
Write-Through
Write-Protect
Writeback
Datasheet
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