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Copyright and Disclaimer
Transaction Layer OpenCAPI Work Group Specification
TL Specification Working Group
OpenCAPI Consortium
Version 1.0 (25 February 2020)
Copyright © OpenCAPI Consortium 2016-2020.
Printed in the United States of America February 25, 2020 (CS.2.001).
Use of this document (including for investigative purposes, research, development, productizing, etc.) is controlled by the
OpenCAPI License Agreement, which is available at
http://www.opencapi.org
All capitalized terms in the following text have the meanings assigned to them in the OpenCAPI Intellectual Property
Rights Policy (the “OpenCAPI IPR Policy”). The full Policy may be found at the OpenCAPI website.
This document and the information contained herein is provided on an “AS IS” basis AND TO THE MAXIMUM EXTENT
PERMITTED BY APPLICABLE LAW, THE OPENCAPI CONSORTIUM AS WELL AS THE AUTHORS AND DEVEL-
OPERS OF THIS DRAFT STANDARD OR OTHER DOCUMENT HEREBY DISCLAIM ALL OTHER WARRANTIES AND
CONDITIONS, EITHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
WARRANTIES, DUTIES OR CONDITIONS OF MERCHANTABILITY, OF FITNESS FOR A PARTICULAR PURPOSE,
OF ACCURACY OR COMPLETENESS OF RESPONSES, OF RESULTS, OF WORKMANLIKE EFFORT, OF LACK OF
VIRUSES, OF LACK OF NEGLIGENCE OR NON-INFRINGEMENT.
This document is a draft document and has not been adopted by the OpenCAPI Consortium. This document is provided
for information only and not for implementation. Note: Except with respect to use by an OpenCAPI Consortium Working
Group, no portion of this document is, or will be, subject to the licensing obligations found in the OpenCAPI Consortium
IPR Policy until such time, if ever, as it is incorporated into a finally adopted OpenCAPI Consortium standard.
OpenCAPI and the OpenCAPI logo design are trademarks of the OpenCAPI Consortium.
Other company, product, and service names may be trademarks or service marks of others.
While the information contained herein is believed to be accurate, such information is preliminary, and should not be
relied upon for accuracy or completeness, and no representations or warranties of accuracy or completeness are made.
Abstract
This document details the OpenCAPI TL specification. It is the work product of the OpenCAPI Consortium TL
Specification Work Group.
This document is handled in compliance with the requirements outlined in the OpenCAPI Consortium Work
Group (WG) process document. Comments, questions, etc. can be submitted to membership@opencapi.org
.
OCC Members Review Draft
TL title.fm.Version 1.0
25 February 2020—OpenCAPI Confidential
Approved for Distribution to OpenCAPI members only
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
TL title.fm.Version 1.0
25 February 2020—OpenCAPI Confidential
Approved for Distribution to OpenCAPI members only
Participants
Page 3 of 244
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
Participants
Brian Allison, IBM, Chair
Michael Siegel, IBM, Technical Editor
Sanjay Goyal, Microchip Rick Hagen, NVIDIA Paul Hartke, Xilinx
Curt Wollbrink, IBM
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
OpenCAPI TLTOC.fm.Version 1.0
25 February 2020—OpenCAPI Confidential
Approved for Distribution to OpenCAPI members only
Contents
Page 4 of 244
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
Contents
List of figures .................................................................................................................. 7
List of tables .................................................................................................................... 8
Revision log ................................................................................................................... 10
About this document .................................................................................................... 13
Architecture compliance terminology .................................................................................................... 13
Conventions used in this specification .................................................................................................. 13
Bit and byte numbering ................................................................................................................... 13
Representation of numbers ............................................................................................................ 14
RTL notation ................................................................................................................................... 14
Notes ..................................................................................................................................................... 15
Engineering notes ........................................................................................................................... 15
Developer notes ............................................................................................................................. 15
Command flows and transaction diagrams ........................................................................................... 16
Command flow diagrams ................................................................................................................ 16
Transaction diagrams ..................................................................................................................... 16
Terms ............................................................................................................................. 19
1. Overview .................................................................................................................... 28
1.1 OpenCAPI protocol stack ................................................................................................................ 29
1.2 Host operation modes ..................................................................................................................... 30
1.2.1 No attached device (C0, M0) ................................................................................................. 30
1.2.2 MEM-only mode (C0, M1) ..................................................................................................... 30
1.2.3 Checkout mode (C1, M0) ...................................................................................................... 31
1.2.4 Checkout with MEM (C1, M1) ................................................................................................ 31
1.2.5 Cache-only mode (C2, M0) ................................................................................................... 31
1.2.6 Cache + MEM mode (C2, M1) ............................................................................................... 31
1.3 AFU
C2
............................................................................................................................................. 32
1.3.1 Host proxy cache ................................................................................................................... 32
1.3.2 AFU
C2
model ......................................................................................................................... 32
1.3.2.1 host_tag database .......................................................................................................... 32
1.3.2.2 L1 EA cache directory .................................................................................................... 33
1.3.2.3 data cache ...................................................................................................................... 33
1.3.3 AFU cache states .................................................................................................................. 34
1.3.4 AFU Cache state transition reporting, initiation, and characteristics ..................................... 35
1.3.5 Design considerations when the AFU
C2
and host cache line sizes are different .................. 40
1.3.5.1 Read commands ............................................................................................................ 40
1.3.5.2 Force evict ...................................................................................................................... 40
1.3.5.3 Upgrade state command ................................................................................................ 40
1.4 Command ordering ......................................................................................................................... 41
1.5 Host tags ......................................................................................................................................... 41
1.5.1 host_tag run-length-capability ............................................................................................... 43
1.5.2 host_tag update ordering ....................................................................................................... 43
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
OpenCAPI TLTOC.fm.Version 1.0
25 February 2020—OpenCAPI Confidential
Approved for Distribution to OpenCAPI members only
Contents
Page 5 of 244
OpenCAPI 4.0
Transaction Layer
OCC Members Review Draft OpenCAPI Work Group Specification
1.5.2.1 TL and host rules ............................................................................................................ 43
1.5.2.2 TLX and AFU rules ......................................................................................................... 43
1.6 Write fragmentation ordering and atomicity .................................................................................... 44
1.6.1 Write fragmentation ordering and atomicity at the host ......................................................... 44
1.6.1.1 Partial write operations ................................................................................................... 44
1.6.1.2 64-,128-, 256-byte write operations ................................................................................ 44
1.6.2 Write fragmentation ordering and atomicity at the AFU ......................................................... 45
1.6.2.1 Partial write operations ................................................................................................... 45
1.6.2.2 64-, 128-, 256-byte write operations ............................................................................... 45
1.7 OpenCAPI device PA space specification ...................................................................................... 45
1.7.1 PA-to-RA mapping rules ........................................................................................................ 46
1.8 Address translation ......................................................................................................................... 47
1.8.1 Effective to real address translation ...................................................................................... 47
1.8.2 Translated addresses, AFU ATC, and dot-t commands ........................................................ 47
1.8.2.1 AFU initiated AFU ATC entry invalidation ...................................................................... 48
1.8.2.2 Host initiated AFU ATC entry invalidation ...................................................................... 49
2. TL and TLX command and response specifications ............................................. 50
2.1 Handling multiple responses to a single command ......................................................................... 55
2.1.1 TLX Read request getting multiple TL responses ................................................................. 56
2.1.2 TLX Write request getting multiple TL responses ................................................................ 56
2.1.3 TL read request getting multiple TLX responses. .................................................................. 57
2.1.4 TL write request getting multiple TLX responses .................................................................. 57
2.2 TL CAPP command packets ........................................................................................................... 59
2.3 TLX AP command packets .............................................................................................................. 84
2.4 TL CAPP response packets .......................................................................................................... 125
2.5 TLX AP response packets ............................................................................................................. 153
3. Virtual channel and data credit pool specification .............................................. 166
3.1 Virtual channel .............................................................................................................................. 167
3.1.1 TLX command and response VC (TLX.vc) .......................................................................... 167
3.1.2 TL command and response VC (TL.vc) ............................................................................... 167
3.1.3 VC credit count specification ............................................................................................... 168
3.2 Data credit pool ............................................................................................................................. 168
3.2.1 TLX data DCP (TLX.dcp) ..................................................................................................... 168
3.2.2 TL data DCP (TL.dcp) ......................................................................................................... 169
3.2.3 DCP credit count specification ............................................................................................. 169
3.3 TL Virtual channel and service queues ......................................................................................... 171
3.3.1 Host TLX command handling .............................................................................................. 171
3.3.2 Host TLX response handling ............................................................................................... 173
3.4 TL Presync queues ....................................................................................................................... 174
3.4.1 TL queuing and service of kill_xlate_done ........................................................................ 176
3.5 Device TL virtual channel queues ................................................................................................. 177
3.6 Virtual channel dependency rules ................................................................................................. 179
3.6.1 Dependency loop 1 resolution ............................................................................................. 181
4. The acTag table ....................................................................................................... 183
4.1 acTag table contents ..................................................................................................................... 183
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