User`s guide

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The XMI

2.2.2 XMI I/O Space

XMI I/O space is divided into private space, nodespace, and ten I/O

adapter address space regions.

Figure 2–5 XMI I/O Space Address Allocation

32−Bit 30−Bit

Byte Address Byte Address Size

0000

XMI Private Space 24 Mbytes

16 x 512 Kbytes

32 Mbytes

128 Mbytes

32 Mbytes

XMI Nodespace

I/O Adapter 1 Address Space

Non−I/O Space

msb−p373A−90

E000

E180

E200

E400

E600

E800

EA00

EC00

F400

F600

F800

FA00

FC00

FE00

2000

2180

2200

2400

2600

2800

2A00

2C00

3400

3600

3800

3A00

3C00

3E00

I/O Adapter 2 Address Space

I/O Adapter 3 Address Space

I/O Adapter 4 Address Space

I/O Adapter 5 Address Space

I/O Adapter A Address Space

I/O Adapter B Address Space

I/O Adapter C Address Space

I/O Adapter D Address Space

I/O Adapter E Address Space

2.2.2.1 XMI Private Space

References to XMI private space are serviced by resources local to a node,

such as local device CSRs and boot ROM. The references are not broadcast

on the XMI. XMI private space is a 24-Mbyte address region located from

E000 0000 to E17F FFFF (32-bit address) or from 2000 0000 to 217F

FFFF (30-bit address).

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