Avago Technologies LSI53C895A - Manual (Page 28)

2-2 Functional Description
Figure 2.1 LSI53C895A Block Diagram
2.1 PCI Functional Description
The LSI53C895A implements a PCI-to-Wide Ultra2 SCSI controller.
2.1.1 PCI Addressing
There are three physical PCI-defined address spaces:
•
PCI Configuration space.
•
I/O space for operating registers.
•
Memory space for operating registers.
32-Bit PCI Interface, PCI Configuration Register
8 Kbyte
SCRIPTS RAM
8 Dword SCRIPTS
Prefetch Buffer
944
b
y
te
DMA
F
IF
O
SC
S
I
SC
R
IPT
S
P
rocess
o
r
O
per
a
ting
Regis
ters
R
O
M
/F
lash
M
em
or
y
C
ont
rol
S
e
ri
al
EE
PR
O
M
Cont
roller
a
n
d
A
ut
oc
onf
igurat
ion
Local
Memory
Bus
SCSI FIFO and SCSI Control Block
Universal TolerANT
Drivers and Receivers
JTAG
PCI Bus
JTAG Bus Wide Ultra2 SCSI
Bus
ROM/Flash
Memory
Bus
2-Wire Serial
EEPROM
Bus
Wide Ultra2 SCSI Controller