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94 21555 Non-Transparent PCI-to-PCI Bridge User Manual
Serial ROM Interface
Note: When a SROM access using the CSR mechanism is attempted when the SROM is not
implemented, the ROM interface may hang. This prevents access to any PROMs that may be
present. A chip reset may be needed to put the ROM interface in an operational state
.
Figure 19. SROM Write All Timing Diagram
Figure 20. SROM Write Enable Timing Diagram
Figure 21. SROM Write Disable Timing Diagram
A7476-01
pr_ad[1]
(sr_di)
pr_ad[2]
(sr_do)
sr_cs
pr_ad[0]
(sr_ck)
1100
0
X X
D0
D1D7
A7477-01
X
X
pr_ad[1]
(sr_di)
sr_cs
pr_ad[0]
(sr_ck)
1
100 1
A7478-01
X
X
pr_ad[1]
(sr_di)
sr_cs
pr_ad[0]
(sr_ck)
1
0
00 0
- 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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