Motorola MVME2400 Series Service Manual download pdf (Page 145)

100

101

Registers

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START Start Address. This field determines the start address of

a particular memory area on the PPC bus which will be

used to access PCI bus resources. The value of this field

will be compared with the upper 16 bits of the incoming

PPC address.

END End Address. This field determines the end address of a

particular memory area on the PPC bus which will be used

to access PCI bus resources. The value of this field will be

compared with the upper 16 bits of the incoming PPC

address.

PPC Slave Offset/Attribute (0, 1 and 2) Registers

The PPC Slave Offset Registers

(XSOFF0, XSOFF1, and XSOFF2)

contains offset information associated with the mapping of PPC memory

space to PCI memory/io space. The field within the XSOFFx registers is

defined as follows:

XSOFFx PPC Slave Offset. This register contains a 16-bit offset

that is added to the upper 16 bits of the PPC address to

determine the PCI address used for transfers from the PPC

bus to PCI. This offset allows PCI resources to reside at

addresses that would not normally be visible from the

PPC bus.

Address XSOFF0/XSATT0 - $FEFF0044

XSOFF1/XSATT1 - $FEFF004C

XSOFF2/XSATT2 - $FEFF0054

Bit

Name XSOFFx XSATTx

REN

WEN

WPEN

MEM

IOM

Operation R/W R

R/W

Reset $0000 $00

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 353 354

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Motorola MVME2400 Series Service Manual Page 145

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