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21555 Non-Transparent PCI-to-PCI Bridge User Manual 173
List of Registers
Table 102. Primary Clear IRQ and Secondary Clear IRQ Registers
These registers affect primary and secondary interrupts in the same way and are described together.
Bit Name R/W Description
15:0 CLR_IRQ R/W1TC
This register controls the state of the Primary or Secondary Interrupt
Request bits.
• When 0, Does not cause the corresponding primary or secondary
interrupt signal to be asserted.
• When 1, the primary or secondary interrupt signal is asserted when
the corresponding IRQ Mask bit is zero.
Writing a 1 to a bit in this register clears the corresponding interrupt
request bit to 0. Writing a 0 to any bit in this register has no effect.
Reading this register returns the current status of the interrupt
request bits.
• Reset value is 0
Table 103. Primary Set IRQ and Secondary Set IRQ Registers
Bit Name R/W Description
15:0 SET_IRQ R/W1TS
This register controls the state of the Primary or Secondary Interrupt
Request bits.
• When 0, Does not cause the corresponding primary or secondary
interrupt signal to be asserted.
• When 1, the primary or secondary interrupt signal is asserted if the
corresponding IRQ Mask bit is zero.
Writing a 1 to a bit in this register sets the corresponding interrupt
request bit to 1. Writing a 0 to any bit in this register has no effect.
Reading this register returns the current status of the interrupt
request bits.
• Reset value is 0
Primary Clear IRQ Secondary Clear IRQ
Byte Offset: 099:098h 09B:09Ah
These registers affect primary and secondary interrupts in the same way and are described together.
Offsets Primary Set IRQ Secondary Set IRQ
Byte 09D:09Ch 09F:09Eh
- 21555 Non-Transparent PCI-to 1
- PCI Bridge 1
- Contents 3
- Preface 1 11
- 1.1 Cautions and Notes 12
- 1.2 Data Units 12
- 1.3 Numbering 12
- 1.4 Signal Nomenclature 13
- 1.5 Register Abbreviations 14
- Introduction 2 15
- Intelligent Subsystem 16
- -time resources 17
- 2.2 Architectural Overview 18
- Introduction 19
- 2.3 Special Applications 20
- 2.4 Programming Notes 20
- 2.4.2 Transaction Forwarding 21
- 2.4.3 ROM Access 21
- Signal Descriptions 3 23
- Signal Descriptions 24
- -Bit Extension Signals 26
- Table 1 28
- Signals 30
- 3.5 Miscellaneous Signals 31
- Address Decoding 4 33
- 4.1 CSR Address Decoding 34
- Setup Register 35
- Base Address Register 35
- Base Address 36
- Address Map 36
- Base Offset 36
- A7463-01 37
- A7464-01 37
- A7465-01 39
- Base + Offset 40
- Translated 40
- A7467-01 41
- 4.5 Configuration Accesses 44
- 4.6 21555 Bar Summary 47
- PCI Bus Transactions 5 49
- 5.2 Posted Write Transactions 50
- 5.2.4.2 Fast Back-to-Back 52
- 5.2.4.3 Write-Through 53
- 5.4 Delayed Read Transactions 55
- 5.4.1 Nonprefetchable Reads 56
- 5.4.2 Prefetchable Reads 57
- -prefetchable 58
- -Through Mode 58
- 5.6 Target Terminations 60
- 5.7 Ordering Rules 61
- Initialization Requirements 6 65
- 6.2 Reset Behavior 66
- 6.3 21555 Initialization 68
- 6.3.2 Without Serial Preload 69
- 6.4 Power Management Support 70
- 6.4.2 PME# Support 71
- -Swap Functionality 72
- -Swap Connections 73
- -Swap Insertion and Removal 75
- Clocking 7 77
- A7497-01 78
- 7.3 66 MHz Support 79
- Parallel ROM Interface 8 81
- Parallel ROM Interface 82
- 8.3 PROM Read by CSR Access 84
- A7456-01 85
- 8.4 PROM Write by CSR Access 86
- 8.5 PROM Dword Read 87
- A7472-01 88
- Serial ROM Interface 9 91
- A7478-01 94
- Serial ROM Interface 95
- Arbitration 10 97
- A7492-01 99
- 11.2 Interrupt Support 101
- 11.3 Doorbell Interrupts 103
- 11.4 Scratchpad Registers 103
- Error Handling 12 105
- Error Handling 106
- 12.2 Parity Errors 107
- JTAG Test Port 13 111
- 13.2.1 Initialization 112
- I2O Support 14 113
- 14.2 Outbound Message Passing 115
- 14.3 Notes 116
- VPD Support 15 119
- 15.2 Writing VPD Information 120
- List of Registers 16 121
- 16.2 Configuration Registers 122
- List of Registers 123
- 16.4 Address Decoding 130
- (Sheet 1 of 2) 131
- (Sheet 2 of 2) 131
- (Sheet 2 of 2) 132
- -only bit and always 133
- -bit memory 134
- -bit addressing and 134
- Bit Name R/W Description 140
- -Response 143
- Table 53. I/O CSR 146
- 16.5 PCI Registers 147
- Table 59. Vendor ID Register 148
- Table 60. Device ID Register 148
- -Class Code (SCC) 152
- Table 68. BiST Register 153
- -MHz bus 157
- -robin arbitration scheme to 157
- 16.6 I2O Registers 165
- Table 85. I2O Inbound Queue 166
- Table 86. I2O Outbound Queue 166
- 16.7 Interrupt Registers 170
- 16.8 Scratchpad Registers 174
- 16.9 PROM Registers 175
- Table 109. ROM Setup Register 177
- Table 110. ROM Data Register 177
- 16.10 SROM Registers 179
- -Class Code 181
- 16.11 Arbiter Control 183
- 16.12 Error Registers 183
- -out condition 184
- 16.13 Init Registers 185
- -Swap registers 189
- JTAG Registers 190
- 16.15 VPD Registers 192
- -byte operations 193
- Acronyms A 195
- VGA – Video Graphics Adapter 196
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