Pci Functional Description; Pci Addressing; Lsi53C875A Block Diagram - LSI LSI53C875A Technical Manual

Figure 2.1

LSI53C875A Block Diagram

Wide Ultra SCSI Controller
4 Kbyte
SCRIPTS RAM
944 byte
DMA FIFO
SCSI FIFO and SCSI Control Block
JTAG
JTAG Bus

2.1 PCI Functional Description

2.1.1 PCI Addressing

2-2
32 Bit PCI Interface, PCI Configuration Register
8 Dword SCRIPTS
Prefetch Buffer
SCSI SCRIPTS
Processor
SE TolerANT
Drivers and Receivers
Wide Ultra
SCSI Bus
The LSI53C875A implements a PCI-to-Wide Ultra SCSI controller.
There are three physical PCI-defined address spaces:
PCI Configuration space.
I/O space for operating registers.
Memory space for operating registers.
Functional Description
PCI Bus
ROM/Flash
Memory
Control
Operating
Registers
Local
Memory
Bus
ROM/Flash
Memory Bus
Serial EEPROM
Controller and
Autoconfiguration
2-Wire Serial
EEPROM Bus