RIVA128ZX datasheet(74/85 Pages) STMICROELECTRONICS

74 / 85 page

128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA128ZX

74/85

Byte offsets 0x13 - 0x10

Base Memory Address Register (0x13 - 0x10)

0x13

0x12

0x11

0x10

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

76543

210

Bits

Function

RW I

31:24

The BASE_ADDRESS bits contain the most significant bits of the base

address of the device. This indicates that the RIVA128ZX requires a 16MByte

block of contiguous memory beginning on a 16MByte boundary. This memory

range contains memory-mapped registers and FIFOs and should not be set

as part of a PentiumPro

™’s write combining range.

RW 0

23:4

The BASE_RESERVED bits form the least significant bits of the base address

and are hardwired to 0.

R- 0

The PREFETCHABLE bit indicates that there are no side effects on reads,

that the device returns all bytes on reads regardless of the byte enables, and

that host bridges can merge processor writes into this range without causing

errors.

R- 1

2:1

The ADDRESS_TYPE bits contain the type (width) of the Base Address.

0=32-bit

R- 0

The SPACE_TYPE bit indicates whether the register maps into Memory or I/O

space.

0=Memory space

R- 0

RIVA128ZX Datasheet(PDF) 74 Page - STMicroelectronics