PCI Configuration Registers
A-8
This register holds the base address for ThunderLAN’s register set in I/O
space. Bit 0 of this register is hardwired to a 1 to indicate that this is a memory-
mapped base address. Bits 1 through 3 are hardwired to 0 to indicate that the
register set occupies four 32-bit words.
A.1.13 PCI Memory Base Address Register (@ 14h)
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Memory Base Address 16 MSBs
0
0
0
Memory Base Address 12 LSBs
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
0
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
This register holds the base address for ThunderLAN’s register set in memory
space. Bit 0 of this register is hardwired to a 0 to indicate that this is a memory-
mapped base address. Bits 1 and 2 are hardwired to 0 to indicate that the regis-
ter set can be located anywhere in 32-bit address space. Bit 3 of this register
(prefetchable bit) is hardwired to a 0, indicating that prefetching is not allowed.
A.1.14 PCI BIOS ROM Base Address Register (@ 30h)
Reserved
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
BIOS ROM Base Address 16 MSBs
BRE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
This register holds the base address for ThunderLAN’s BIOS ROM in memory
space. Bit 0, BRE, is an enable bit for BIOS ROM accesses. When set to a 1,
BIOS ROM accesses are enabled; when set to a 0 they are disabled. (The
Mem_En in the PCI command register must also be set to allow BIOS ROM
accesses.)
A.1.15 PCI NVRAM Register (@ 34h)
This register allows configuration space access to the external EEPROM, in
addition to the normal DIO space access through the NetSio register. Control
of the EEPROM interface swaps between these two control registers on a
most-recently-written basis. Whenever the PCI NVRAM register is written to,
it takes control of the EEPROM interface pins. Whenever the DIO_DATA regis-
ter is written to, the NetSio register takes control of the EEPROM interface
Содержание ThunderLAN TNETE100A
Страница 1: ...ThunderLAN TNETE100A TNETE110A TNETE211 Programmer s Guide October 1996 Network Business Products ...
Страница 2: ...Printed in U S A October 1996 L411001 9761 revisionA SPWU013A ...
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