PC87200VUL160A NSC [National Semiconductor], PC87200VUL160A Datasheet - Page 16

• Manufacturer Part Number: PC87200VUL160A
• Description: PC87200 PCI to ISA Bridge
• Manufacturer: NSC [National Semiconductor]

7.0 Register Descriptions
The 87200 is a single function device. Its register space is
called the Bridge Configuration Registers Space (F0)
which is accessed through the PCI interface using the PCI
Type One Configuration Mechanism.
The PCI header is a 256-byte region used for configuring a
PCI device or function. The first 64 bytes are the same for
all PCI devices and are predefined by the PCI specification.
These registers are used to configure the PCI for the
device. The rest of the 256-byte region is used to configure
the device or function itself.
00h-01h
02h-03h
04h-05h
06h-07h
08h
09h-0Bh
0Ch
0Dh
0Eh
0Fh
10h-3Fh
40h
41h
42h
43h
44h
45h-4Fh
50h
51h
52h
53h-5Ah
5Bh
5Ch-FFh
F0 Index
Width (Bits)
16
16
16
16
24
--
--
--
--
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Table 3. Function 0: Bridge Configuration Registers Summary
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
RO
RO
RO
RO
--
--
--
--
Vendor Identification Register
Device Identification Register
PCI Command Register
PCI Status Register
Device Revision ID Register
PCI Class Code Register
PCI Cache Line Size Register
PCI Latency Timer Register
PCI Header Type Register
PCI BIST Register
Reserved
PCI Function Control Register 1
PCI Function Control Register 2
PCI Function Control Register 3
PCI Function Control Register 4
Reset Control Register
Internal use, do not overwrite
ISA CLK Divider
ISA I/O Recovery Control Register
ROM/AT Logic Control Register
Internal use, do not overwrite
Decode Control Register 2
Internal use, do not overwrite
16
The remaining subsections of this chapter is as follows:
— A brief discussion on how to access the registers located
— Register summary.
— Detailed bit formats of all registers.
7.1 Register Summary
The tables in this subsection summarize all the registers of
the PC87200. Included in the tables are the register’s reset
values.
in the PCI Configuration Space.
Name
Reset Value
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060100h
100Bh
0021h
0107h
0280h
00h
00h
00h
00h
00h
00h
79h
10h
28h
46h
00h
43h
43h
04h
00h
--
--
--