ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 46

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

4.1.1
Each GLIU has seven channels with Channel 0 being the
GLIU itself and therefore not considered a physical port.
Figure 4-1 illustrates the GeodeLink architecture in a
Geode LX processor, showing how the modules are con-
nected to the two GLIUs. GLIU0 has five channels con-
nected, and GLIU1 has six channels connected. To get
MSR address/data across the PCI bus, the GLPCI con-
verts the MSR address into PCI cycles and back again.
An MSR address is parsed into two fields, the port address
(18 bits) and the index (14 bits). The port address is further
parsed into six 3-bit channel address fields. Each 3-bit field
represents, from the perspective of the source module, the
GLIU channels that are used to get to the destination mod-
ule, starting from the closest GLIU to the source (left most
3-bit field) to the farthest GLIU (right most 3-bit field).
In a Geode LX processor/CS5536 system, the companion
device is connected to the Geode LX processor via the PCI
bus. The internal architecture of the companion device
uses the same GeodeLink architecture with one GLIU
being in that device. Hence, in a Geode LX processor/
CS5536 system there are a total of three GLIUs: two in the
Geode LX processor and one in the companion device.
Therefore at most, only the two left most 3-bit fields of the
base address field should be needed to access any mod-
ule in the system. There are exceptions that require more;
see Section 4.1.2 "Port Addressing Exceptions" on page
47. For the CPU Core to access MSR Index 300h in the
GeodeLink Control Processor (GLCP) module, the address
is 010_011_000_000_000_000b (six channel fields of the
port address) + 300h (Index), or 4C000300h. The 010b
points to Channel 2 of GLIU0, which is the channel con-
nected to GLIU1. The 011b points to the GLIU1 Channel 3,
which is the channel to the GLCP module. From this point
on, the port address is abbreviated by noting each channel
address followed by a dot. From the above example, this is
represented by 2.3.0.0.0.0. It is important to repeat here
that the port address is derived from the perspective of the
source module.
For a module to access an MSR within itself, the port
address is zero.
46
Port Address
33234C
Not Used
Not Used
Security Block
Figure 4-1. GeodeLink™ Architecture
(AES)
Not Used
7
7
AMD Geode™ LX Processors Data Book
6
6
GLIU0
0
0
GLIU0
GLIU1
GLPCI
GLMC
1
1
GeodeLink™ Interface Unit
2
4
GLIU1
GLPCI
3
2
CPU Core
5
5
GP
VP
VIP
4
3
PCI Bus
DC
GLCP