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126 21555 Non-Transparent PCI-to-PCI Bridge User Manual
List of Registers
16.3 Control and Status Registers
The control and status registers are memory mapped in the Primary CSR and Memory 0 Base Address window and
the Secondary CSR Base Address window. These registers are I/O mapped in the Primary CSR I/O BAse Address
window and the Secondary CSR I/O Base Address window. Offsets are referenced from these base addresses.
Table 33 lists the CSR summary. 017:014
EC CompactPCI Hot-Swap
Capability Identifier and Next
Pointer Register, page 189
Hot-Swap Cap ID
Hot-Swap Next Ptr
06 — Secondary N
ED 00 — NN
EE
CompactPCI Hot-Swap Control
Register, page 189
Hot-Swap Control
00x1000b — YN
FF:F0 Reserved 00000000 — NY
Table 33. CSR Address Map (Sheet 1 of 5)
Byte
Offset
(Hex)
Register Name Reset Value Write Access Read Access
003:000
Downstream and Upstream Configuration
Address Registers, page 141
Downstream Configuration Address
Indeterminate Primary Y
007:004
Downstream Configuration Data and
Upstream Configuration Data Registers,
page 142
Downstream Configuration Data
Indeterminate Primary Primary
00B:008
Downstream and Upstream Configuration
Address Registers, page 141
Upstream Configuration Address
Indeterminate Secondary Y
00F:00C
Downstream Configuration Data and
Upstream Configuration Data Registers,
page 142
Upstream Configuration Data
Indeterminate Secondary Secondary
010 Configuration Own Bits Register, page 142
Configuration Own Byte 0
Configuration Own Byte 1
00 N
Primary Read-
0-to-set
011 00 N
Secondary
Read-0-to-set
013:012
Configuration CSR, page 143
Configuration CSR
0000 Y Y
017:014
Downstream I/O Address and Upstream I/O
Address Registers, page 144
Downstream I/O Address
Indeterminate Primary Y
Table 32. Configuration Space Address Register (Sheet 5 of 5)
Byte
Offset
(Hex)
Register Name
Reset Value
(Hex)
Preload
Write
Access
Read
Access