LSI53C825AJ LSI, LSI53C825AJ Datasheet - Page 25
LSI53C825AJ
Manufacturer Part Number
LSI53C825AJ
Description
Manufacturer
LSI
Datasheet
1.LSI53C825AJ.pdf
(306 pages)
Specifications of LSI53C825AJ
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2.1 PCI Addressing
2.1.1 Configuration Space
Chapter 2
Functional Description
Chapter 2 is divided into the following sections:
There are three physical PCI-defined address spaces:
Configuration space is a contiguous 256 x 8-bit set of addresses
dedicated to each “slot” or “stub” on the bus. Decoding C_BE/[3:0]
determines if a PCI cycle is intended to access configuration register
space. The IDSEL bus signal is a “chip select” that allows access to the
configuration register space only. A configuration read/write cycle without
IDSEL is ignored. The eight lower order addresses are used to select a
specific 8-bit register. AD[10:8] are decoded as well, but they must be
zero or the LSI53C825A does not respond. According to the PCI
specification, AD[10:8] are to be used for multifunction devices. The host
processor uses the PCI configuration space to initialize the LSI53C825A.
LSI53C825A/825AE PCI to SCSI I/O Processor
Section 2.1, “PCI Addressing”
Section 2.2, “SCSI Functional Description”
Section 2.3, “External Memory Interface”
Section 2.4, “PCI Cache Mode”
Section 2.5, “Power Management”
PCI
I/O Space
Memory Space
Configuration Space
2-1
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