MPC8280 datasheet(340/1386 Pages) FREESCALE

340 / 1386 page

PCI Bridge

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

9-32

Freescale Semiconductor

9.11.1.5

PCI Outbound Comparison Mask Registers (POCMR

The PCI outbound comparison mask registers (POCMRx), shown in Figure 9-19, defines the window size

to translate.

Figure 9-19. PCI Outbound Comparison Mask Registers (POCMR

Table 9-6 describes POCMRx.

Field

I/O

PRE

—

Reset

0000_0000_0000_0000

R/W

Addr

0x10812 (POCMR0); 0x2082A (POCMR1); 0x10842 (POCMR2)

Field

Reset

0000_0000_0000_0000

R/W

Addr

0x10810 (POCMR0); 0x20828 (POCMR1); 0x10840 (POCMR2)

Table 9-6. POCMR

x Field Descriptions

Bits

Name

Description

Enable

This bit enables this address translation

I/O

This bit indicates that the translation is to PCI memory or PCI I/O space

0 PCI memory

1 PCI I/O

Prefetchable

This bit indicates that the address space is prefetchable, so streaming can occur

0 not prefetchable

1 prefetchable

28–20

—

Reserved, should be cleared.

19–0

Comparison mask

Comparison mask indicates the size of the space to be translated. The value in the

window match. Non-contiguous comparison masks will exhibit unpredictable

behavior.

Examples:

POCMR = 0b0xxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx

Translation is disabled. All addresses received pass through unaltered.

POCMR = 0b1xxx_xxxx_xxxx_1111_1111_1111_1111_1111

20 bits (physical address bits 31-12) are comparison masked for a 4Kbyte window

size. This is the smallest window size allowed.

POCMR = 0b1xxx_xxxx_xxxx_1111_1111_1111_0000_0000

12 bits (physical address bits 31-20) for a 1Mbyte window size.

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