IXB28504XGBEFS Intel, IXB28504XGBEFS Datasheet - Page 122

• Manufacturer Part Number: IXB28504XGBEFS
• Manufacturer: Intel

Specifications of IXB28504XGBEFS

• Lead Free Status / Rohs Status: Compliant

Note:
Figure 36.
9.6.4
Intel NetStructure
TPS
122
3.5 GB
4 GB
0
®
address. Assuming that the RDRAM size is 768MB, and addresses of the IXP2850
registers and PCI devices belong to the 1 GB to 1.5 GB PCI range, the XScale core PCI
memory window has to be remapped to that range. This process is shown in
Using this PCI memory remapping scheme, the NPU can access 512 MB of Adjunct
Processor (AP) memory over the PCI at one time.
PCI memory window remapping
During initialization, the PCI driver performs the following functions specific to the
IXB2850 board hardware:
PCI memory remapping and PCI bus scanning and configuration is performed by the
Boot Monitor. PCI bus scanning in the LSP kernel is disabled.
Banked Flash Memory Support
IXB2850 boards are equipped with 160 MB of flash memory. To enable access to this
memory through the available 32 MB slow port window, it is divided into 5 banks, each
comprising two 16 MB chips. The LSP kernel contains an MTD map driver modified to
support appropriate bank switching.
Figure 37
• Base PCI address calculation
• Mapping PCI interrupts to slot numbers
IXB2850 Packet Processing Boards
PCI MemoryWndow (512 MB)
XScale Addres Space
shows the concept of flash memory bank switching.
1.5 GB
4 GB
1 GB
0
IXB2850—Network Processor Firmware
PCI Addres Space
Document Number: 05-2443-006
Figure
January 2007
36.