Datasheet
PCI Express*
Intel
®
Atom™ Processor E6xx Series Datasheet
119
8.2.1.15 MB — Memory Base Address
Accesses that are within the ranges specified in this register and the ML register will be
sent to the attached device if the Memory Space Enable bit of PCICMD is set. Accesses
from the attached device that are outside the ranges specified will be forwarded to the
internal processor if the Bus Master Enable bit of PCICMD is set.
8.2.1.16 ML — Memory Limit Address
8.2.1.17 PMB — Prefetchable Memory Base Address
This register controls the CPU to PCI Express* prefetchable memory access routing
based on the following formula: PREFETCHABLE_MEMORY_BASE =< address =<
PREFETCHABLE_MEMORY_LIMIT. The upper 12 bits of this register are read/write and
correspond to address bits A[31:20] of the 32-bit address. This register must be
initialized by the configuration software. For the purpose of address decode, address
bits A[19:0] are assumed to be 0. Thus, the bottom of the defined memory address
range will be aligned to a 1 MB boundary.
07 : 00
000000
00b
RO RSVD Reserved
Table 140. Offset 1Eh: SSTS — Secondary Status (Sheet 2 of 2)
Size: 16 bit Default: 0000h Power Well: Core
Access
PCI Configuration B:D:F 0:23-26:0
Offset Start:
Offset End:
1Eh
1Fh
Bit Range Default Access Acronym Description
Table 141. Offset 20h: MB — Memory Base Address
Size: 16 bit Default: 0000h Power Well: Core
Access
PCI Configuration B:D:F 0:23-26:0
Offset Start:
Offset End:
20h
21h
Bit Range Default Access Acronym Description
15 : 04 000h RW MB
Memory Base: These bits are compared with bits 31:20 of the incoming
address to determine the lower 1 MB aligned value of the range.
03 : 00 0h RO RSVD Reserved
Table 142. Offset 22h: ML — Memory Limit Address
Size: 16 bit Default: 0000h Power Well: Core
Access
PCI Configuration B:D:F 0:23-26:0
Offset Start:
Offset End:
22h
23h
Bit Range Default Access Acronym Description
15 : 04 000h RW ML
Memory Limit: These bits are compared with bits 31:20 of the incoming
address to determine the upper 1 MB aligned value of the range.
03 : 00 0h RO RSVD Reserved