XIO2001IZWS.B datasheet(52/145 Pages) TI2

52 / 145 page

8.4.19 Memory Base Register

This read/write register specifies the lower limit of the memory addresses that the bridge forwards downstream.

See Table 8-19 for a complete description of the register contents.

PCI register offset:

20h

Read-only, Read/Write

Default value:

0000h

BIT NUMBER

RESET STATE

Table 8-19. Memory Base Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

15:4

MEMBASE

Memory base. Defines the lowest address of the memory address range that determines when to

forward memory transactions from one interface to the other. These bits correspond to address

bits [31:20] in the memory address. The lower 20 bits are assumed to be 00000h.

3:0

RSVD

Reserved. Returns 0h when read.

8.4.20 Memory Limit Register

This read/write register specifies the upper limit of the memory addresses that the bridge forwards downstream.

See Table 8-20 for a complete description of the register contents.

PCI register offset:

22h

Read-only, Read/Write

Default value:

0000h

BIT NUMBER

RESET STATE

Table 8-20. Memory Limit Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

15:4

MEMLIMIT

Memory limit. Defines the highest address of the memory address range that determines when to

forward memory transactions from one interface to the other. These bits correspond to address

bits [31:20] in the memory address. The lower 20 bits are assumed to be FFFFFh.

3:0

RSVD

Reserved. Returns 0h when read.

8.4.21 Prefetchable Memory Base Register

This read/write register specifies the lower limit of the prefetchable memory addresses that the bridge forwards

downstream. See Table 8-21 for a complete description of the register contents.

PCI register offset:

24h

Read-only, Read/Write

Default value:

0001h

BIT NUMBER

RESET STATE

XIO2001

SCPS212J – MAY 2009 – REVISED JANUARY 2021

www.ti.com

Submit Document Feedback

Product Folder Links: XIO2001

XIO2001IZWS.B Datasheet(PDF) 52 Page - Texas Instruments

XIO2001IZWS.B Datasheet(HTML) 52 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL