ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 49
ALXD800EEXJ2VD
Manufacturer Part Number
ALXD800EEXJ2VD
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.ALXD800EEXJ2VD.pdf
(675 pages)
Specifications of ALXD800EEXJ2VD
Operating Temperature (min)
0C
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
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GeodeLink™ Interface Unit
4.1.3.2
I/O addresses are routed and are never translated. I/O
request routing is performed with a choice of two descriptor
types. Each GLIU may have any number of each descriptor
type. The IOD types satisfy different needs for various soft-
ware models.
Each I/O request is compared against all the IOD. If the I/O
request does not hit in any of the descriptors, the request is
sent to the subtractive port. If the I/O request hits more
than one descriptor, the results are undefined. Software
must provide a consistent non-overlapping I/O address
map. The methods of check and routing are described in
Table 4-4.
IOD Base Mask Descriptors (IOD_BM)
IOD_BM is the simplest descriptor. It usually maps a power
of two size aligned region of I/O to a destination ID.
IOD Swiss Cheese Descriptors (IOD_SC)
The IOD_SC maps an 8-byte region of memory in 1 byte
chunks to one of two devices. The descriptor type is useful
AMD Geode™ LX Processors Data Book
Descriptor
IOD_BM
IOD_SC
I/O Routing and Translation
Function Description
Checks that the physical address supplied by the device on address bits [31:12] with a logic AND with PMASK bits of
the register bits [19:0] are equal to the PBASE bits of the descriptor register bits [39:20].
Also checks that the BIZZARO bit of the request is equal to the PCMP_PIZ bit of the descriptor register bit [60].
If the above matches, then the descriptor has a hit condition and routes the received address to the programmed des-
tination of the P2D_BM register bit [63:61].
DEVICE_ADDR = request address
Checks that the physical address supplied by the device’s request on address bits [31:18] are equal to the PBASE field
of descriptor register bits [13:0] and that the enable write or read conditions given by the descriptor register fields WEN
and REN in bits [47:32] and [31:16], respectively matches the request type and enable fields given on the physical
address bits [17:14] of the device’s request.
If the above matches, then the descriptor has a hit condition and routes the received address to the programmed des-
tination ID, PDID1 field of the descriptor register bits [63:61].
DEVICE_ADDR = request address
Table 4-4. GLIU I/O Descriptor Address Hit and Routing Description
for legacy address mapping. The Swiss cheese feature
implies that the descriptor is used to “poke holes” in I/O.
4.1.3.3
PCI special cycles are performed using I/O writes and set-
ting the BIZARRO flag in the write request. The BIZARRO
flag is treated as an additional address bit, providing
unaliased I/O address. The I/O descriptors are set up to
route the special cycles to the appropriate device (i.e.,
GLCP, GLPCI, etc.). The I/O descriptors are configured to
default to the appropriate device on reset. The PCI special
cycles are mapped as:
Name
Shutdown
Halt
x86 specific
0003h-FFFFh
Special Cycles
BIZZARO
1
1
1
1
33234C
Address
00000000h
00000001h
00000002h
00000002h-0000FFFFh
49
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