SC1100 datasheet(247/348 Pages) NSC

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Core Logic Module (Continued)

Index 20h-23h

Base Address Register 4 - F5BAR4 (R/W)

Reset Value: 00000000h

F5BAR4CS# Address Space. This register allows PCI access to memory mapped devices on the Sub-ISA. Bit 0 must be set to 0, indi-

cating memory address space. Access to maximum address space of 16 MB is supported.

Configuration of this register is programmed through the F5BAR4 Mask Register (F5 Index 50h).

31:24

F5BAR4CS# Base Address.

23:4

F5BAR4CS# Base Address and Address Range.

Prefetchable.

2:1

Type.

Memory Space Indicator. Must be set to 0.

Index 24h-27h

Base Address Register 5 - F5BAR5 (R/W)

Reset Value: 00000000h

F5BAR5CS# Address Space. This register allows PCI access to memory mapped devices on the Sub-ISA. Bit 0 must be set to 0, indi-

cating memory address space. Access to maximum address space of 16 MB is supported.

Configuration of this register is programmed through the F5BAR5 Mask Register (F5 Index 54h).

31:24

F5BAR5CS# Base Address.

23:4

F5BAR5CS# Base Address and Address Range.

Prefetchable.

2:1

Type.

Memory Space Indicator. Must be set to 0.

Index 28h-2Bh

Reserved

Reset Value: 00h

Index 2Ch-2Dh

Subsystem Vendor ID (RO)

Reset Value: 100Bh

Index 2Eh-2Fh

Subsystem ID (RO)

Reset Value: 0505h

Index 30h-3Fh

Reserved

Reset Value: 00h

Index 40h-43h

F5BAR0 Mask Address Register (R/W)

Reset Value: FFFFFFC1h

To use F5BAR0, the mask register should be programmed first. The mask register defines the size of F5BAR0 and whether the

accessed offset registers are memory or I/O mapped.

Note:

Whenever a value is written to this mask register, F5BAR0 must also be written (even if the value for F5BAR0 has not

changed).

Memory Base Address Register (Bit 0 = 0)

31:4

Address Mask. Determines the size of the BAR.

— Every bit that is a 1 is programmable in the BAR.

— Every bit that is a 0 is fixed 0 in the BAR.

Since the address mask goes down to bit 4, the smallest memory region is 16 bytes, however, the PCI specification sug-

gests not using less than a 4 KB address range.

Prefetchable. Indicates whether or not the data in memory is prefetchable. This bit should be set to 1 only if all the following

are true:

— There are no side-effects from reads (i.e., the data at the location is not changed as a result of the read).

— The device returns all bytes regardless of the byte enables.

— Host bridges can merge processor writes into this range without causing errors.

— The memory is not cached from the host processor.

0: Data is not prefetchable. This value is recommended if one or more of the above listed conditions is not true.

1: Data is prefetchable.

2:1

Type.

00: Located anywhere in the 32-bit address space

01: Located below 1 MB

10: Located anywhere in the 64-bit address space

11: Reserved

This bit must be set to 0, to indicate memory base address register.

Table 5-39. F5: PCI Header Registers for X-Bus Expansion (Continued)

Bit

Description

SC1100 Datasheet(PDF) 247 Page - National Semiconductor (TI)

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