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4–2 Chapter 4: Functional Description
Interfaces
RapidIO II MegaCore Function August 2014 Altera Corporation
User Guide
In variations of the RapidIO II IP core that have 128-bit wide Avalon-MM interfaces,
the least significant half of the Avalon-MM 128-bit word corresponds to the 8-byte
double word at RapidIO address N, and the most significant half of the Avalon-MM
128-bit word corresponds to the 8-byte double word at RapidIO address N+8. If two
8-byte double words appear in the RapidIO packet in the order dw0, followed by
dw1, they appear on the 128-bit Avalon-MM interface as the 128-bit word {dw1, dw0}.
Table 4–1 shows the ordering of the bytes in each 8-byte double word. Table 4–2
shows the ordering of the 8-byte double words in each 128-bit Avalon-MM word.
Avalon Streaming (Avalon-ST) Interface
The Avalon-ST interface provides a standard, flexible, and modular protocol for data
transfers from a source interface to a sink interface. The Avalon-ST interface protocol
allows you to easily connect components together by supporting a direct connection
to the Transport layer. The Avalon-ST interface is 128 bits wide. This interface is
available to create custom Logical layer functions like message passing.
For more information about how to use the RapidIO II IP core Avalon-ST interface,
refer to the “Avalon-ST Pass-Through Interface” on page 4–48.
f For more information about the Avalon-ST interface, refer to Avalon Interface
Specifications.
RapidIO Interface
The RapidIO interface complies with revision 2.2 of the RapidIO
®
serial interface
standard described in the RapidIO Trade Association specifications. The protocol is
divided into a three-layer hierarchy: Physical layer, Transport layer, and Logical layer.
Avalon-
MM
Protocol
(Little
Endian)
Byte7[7:0] Byte6[7:0] Byte5[7:0] Byte4[7:0] Byte3[7:0] Byte2[7:0] Byte1[7:0] Byte0[7:0]
Address=
N+7
Address=
N+6
Address=
N+5
Address=
N+4
Address=
N+3
Address=
N+2
Address=
N+1
Address=
N
32-Bit Word[31:0] 32-Bit Word[31:0]
Avalon-MM Byte Address = N+4 Avalon-MM Byte Address = N
64-bit Double Word0[63:0]
Avalon-MM Byte Address = N
Table 4–1. Byte Ordering (Part 2 of 2)
Byte
Lane
(Binary)
1000_0000 0100_0000 0010_0000 0001_0000 0000_1000 0000_0100 0000_0010 0000_0001
Table 4–2. Double-Word Ordering in a 128-Bit Avalon-MM Interface
Protocol
RapidIO Protocol
(Big Endian)
Second Transmitted Double Word[0:63] First Transmitted Double Word[0:63]
(1)
RapidIO Byte Address N + 8 RapidIO Byte Address N = {29'hn, 3'b000}
Avalon-MM Protocol
(Little Endian)
64-Bit Double Word[63:0] 64-Bit Double Word[63:0]
Avalon-MM Byte Address = N+8 Avalon-MM Byte Address = N
Note to Table 4–2:
(1) Bit 0 of the RapidIO double word is transmitted first on the RapidIO link.
- User Guide 1
- RapidIO II MegaCore Function 1
- Contents 3
- Contents v 5
- Chapter 5. Signals 6
- Chapter 6. Software Interface 6
- Chapter 7. Testbench 6
- 1. About The RapidIO II 9
- MegaCore Function 9
- Releases 10
- RapidIO II IP Core Features 10
- Features 11
- Device Family Support 12
- IP Core Verification 13
- Hardware Testing 14
- Interoperability Testing 14
- Note to Table 1–3: 16
- Notes to Table 1–4: 16
- Installation and Licensing 17
- 2. Getting Started 19
- Simulating IP Cores 22
- Transceiver Settings 26
- External Transceiver PLL 26
- 3. Parameter Settings 31
- Note to Table 3–1: 32
- Enable 16-Bit Device ID Width 33
- Logical Layer Settings 34
- Capability Registers Settings 35
- Device ID 36
- Vendor ID 36
- Revision ID 36
- Assembly ID 36
- Assembly Information CAR 37
- Enable Flow Control Support 38
- Enable Switch Support 38
- Number of Ports 38
- Port Number 39
- Maximum PDU 39
- Destination Operations CAR 40
- Port General Control CSR 40
- Port 0 Control CSR 41
- Lane n Status 0 CSR 41
- Extended Features Pointer CSR 41
- 4. Functional Description 43
- Note to Table 4–2: 44
- Clocking and Reset Structure 45
- Notes to Table 4–3: 46
- RapidIO II 47
- Transactions 55
- Notes to Table 4–6: 57
- Notes to Table 4–7: 59
- Note to Table 4–8: 59
- Note to Figure 4–9: 66
- Note to Table 4–10: 70
- Notes to Table 4–11: 71
- Table 6–60 on page 6–40 72
- Note to Table 4–12: 73
- Maintenance Module 74
- Maintenance Interface Signals 75
- Doorbell Module Block Diagram 86
- Preserving Transaction Order 87
- Doorbell Module Signals 88
- Generating a Doorbell Message 88
- Receiving a Doorbell Message 89
- Transaction ID Ranges 90
- Notes to Table 4–24: 92
- Note to Table 4–26: 94
- Note to Table 4–27: 95
- field 97
- User Receiving Write Request 100
- Logical Layer Interfaces 101
- Transport Layer 112
- Receiver 113
- Transmitter 114
- Physical Layer 115
- Physical Layer Interfaces 116
- Low-level Interface Receiver 116
- CRC Checking and Removal 117
- Protocol Violations 119
- Fatal Errors 119
- Maintenance Avalon-MM Slave 120
- Maintenance Avalon-MM Master 121
- Port-Write Reception Module 122
- Input/Output Avalon-MM Slave 122
- Input/Output Avalon-MM Master 123
- 5. Signals 125
- Physical Layer Signals 126
- Low Latency Signals 127
- Multicast Event Signals 128
- Chapter 5: Signals 5–5 129
- Note to Table 5–7: 130
- Chapter 5: Signals 5–7 131
- 5–8 Chapter 5: Signals 132
- Register-Related Signals 133
- Avalon-MM Interface Signals 133
- Note to Table 5–12: 134
- Chapter 5: Signals 5–11 135
- Note to Table 5–15: 136
- Error Reporting Signals 137
- 5–14 Chapter 5: Signals 138
- 6. Software Interface 139
- Memory Map 140
- Physical Layer Registers 144
- Note to Table 6–9: 147
- Note to Table 6–14: 154
- Note to Table 6–15: 158
- Note to Table 6–17: 160
- Note to Table 6–22: 164
- Note to Table 6–23: 164
- Note to Table 6–24: 165
- Note to Table 6–25: 165
- Note to Table 6–26: 166
- Note to Table 6–27: 167
- Notes to Table 6–28: 168
- Notes to Table 6–29: 169
- Note to Table 6–30: 169
- Note to Table 6–31: 169
- Notes to Table 6–32: 170
- Note to Table 6–34: 171
- Note to Table 6–35: 171
- Note to Table 6–36: 172
- Note to Table 6–37: 172
- Transmit Port-Write Registers 174
- Receive Port-Write Registers 175
- Note to Table 6–59: 178
- Error Management Registers 180
- Note to Table 6–66: 181
- Notes to Table 6–67: 183
- Notes to Table 6–70: 185
- Notes to Table 6–71: 185
- Doorbell Message Registers 191
- Note to Table 6–89: 193
- 7. Testbench 195
- 7–2 Chapter 7: Testbench 196
- Testbench Overview 196
- Testbench Sequence 197
- 7–4 Chapter 7: Testbench 198
- Chapter 7: Testbench 7–5 199
- SWRITE Transactions 200
- NREAD Transactions 200
- NWRITE_R Transactions 201
- NWRITE Transactions 202
- Doorbell Transactions 202
- Port-Write Transactions 203
- Testbench Completion 204
- Chapter 7: Testbench 7–11 205
- 7–12 Chapter 7: Testbench 206
- A. Initialization Sequence 207
- MegaCore Function v12.1 209
- Additional Information 213
- Info–2 Additional Information 214
- Document Revision History 214
- Additional Information Info–3 215
- Info–4 Additional Information 216
- Note to Table: 217
- Info–6 Additional Information 218
- Typographic Conventions 218
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