Registers: 0x18–0x1B

Base Address Register Two (SCRIPTS RAM)

Read/Write

31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BAR2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

 

0

0

 

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BAR2

 

 

 

Base Address Register Two

 

 

 

 

 

 

 

[31:0]

This base register is used to map the SCRIPTS RAM into memory space. The default value of this register is 0x00000000. The LSI53C875A points to 4096 bytes of address space with this register. This register has bits [11:0] hardwired to 0b000000000000. For detailed information on the operation of this register, refer to the PCI 2.2 specification.

Registers: 0x1C–0x27

Not Supported

Registers: 0x28–0x2B

Reserved

Registers: 0x2C–0x2D

Subsystem Vendor ID

Read Only

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

SVID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If MAD[7] HIGH Default

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

0

1

 

0

0

0

 

0

0

0

0

0

0

0

0

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If MAD[7] LOW See Description Default

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

x

 

x

x

x

 

x

x

x

 

x

x

x

x

x

x

x

x

 

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SVID

 

 

Subsystem Vendor ID

 

 

 

 

 

 

[15:0]

 

 

 

 

This 16-bit register is used to uniquely identify the vendor

manufacturing the add-in board or subsystem where this PCI device resides. It provides a mechanism for an add-in card vendor to distinguish its cards from another vendor’s cards, even if the cards have the same PCI

4-10Registers

Page 102
Image 102
LSI 53C875A technical manual Registers 0x18-0x1B, Registers 0x1C-0x27, Registers 0x28-0x2B, Registers 0x2C-0x2D