The following table shows the revision history for this document.
| Section | Revision Summary |
|---|---|
| 9/18/2025 Version 1.6 | |
| Figure 1 | Updated the hole dimension to M2.5(4x) in the top view. |
| Power Sequencing | Updated section with information on power up and power down sequencing. |
| 11/03/2023 Version 1.5 | |
| General | Added KD24 SOM information to guide. Removed the connector specific pinouts and signal naming conventions. See the specific SOM data sheet for that information. |
| Introduction | Removed the K26 SOM Block Diagram. See the Kria K26 SOM Data Sheet (DS987). |
| SOM Connector Overview | Added Connector Compatibility Across Kria SOMs discussion. |
| SOM Connector Power Pins | Removed the SOM Power Rails table and linked to the SOM specific data sheets. |
| 5/25/2023 Version 1.4 | |
| General |
Updated information on MIO banks for MIO[31] (MIO31_PMU_GPI) and MIO[35] (MIO35_PMU_GPO). |
| Sideband Signals | Updated the PS_POR_L signal description. |
| Board to Board Connector PCB Layout for K26 SOM | Updated to clarify images in Figure 1 and Figure 2. |
| References | Updated reference section. |
| 7/27/2022 Version 1.3 | |
| General | Added reference to the REF-226081 Samtec connector throughout data sheet. |
| SOM Configuration and Control Signals | Updated descriptions in Power-on Reset (PS_POR_B) Signal and PS_POR_L. |
| Power Management Signals | Updated the PWRGD_LPD_M2C signal description. |
| 3/16/2022 Version 1.2 | |
| Introduction | Updated the K26 SOM Block Diagram |
| Signal Naming Conventions | Added Table 3: Legend for Pin Types. Added signal to connector mapping using XDC file discussion. |
| SOM240_1 Signal Names and Descriptions | Added the pin type column and updated the descriptions for B28 (MIO35), B29 (MIO36), B30 (MIO37), C30 (MIO29), and C31 (MIO30), and C32 (MIO31). |
| SOM240_2 Connector Pinout | Updated A4 description. |
| SOM240_2 Signal Names and Descriptions | Added the pin type column. |
| Supported I/O Standards | Added power-up and configuration information. |
| PS-GTR Transceivers | Added additional transceiver details. |
| GTH Transceivers (K26 SOM only) | Added additional transceiver details. |
| Transceiver Reference Clocks | Added additional transceiver details. |
| SOM Configuration and Control Signals | Clarifying edits to PS_ERROR_OUT Signal, PS_ERROR_STATUS Commands. |
| Power Management Signals | Updated descriptions on the signals in this section. |
| SOM MIO Design Considerations | Updated mapping instructions and bank diagrams. |
| K26 SOM Mechanical Dimensions | Added clarifying edits to the Figure 1 mechanical drawing. |
| 7/23/2021 Version 1.1 | |
| Introduction | Updated the K26 SOM Block Diagram. |
| SOM240_1 Connector Pinout | Updated MIO35_WD_OUT and MIO26. |
| SOM240_1 Signal Names and Descriptions | Updated descriptions in table. |
| SOM240_2 Connector Pinout | Corrected errors in table. |
| SOM240_2 Signal Names and Descriptions | Updated descriptions in table. |
| Supported I/O Standards | Added description of XCK26 device. |
| SOM I/O Timing Model | Added information on designing with trace length and signal delays, and removed Table 7: K26 SOM PCB Signal Delays by I/O Bank |
| Sideband Signals | Added PS_REF_CLK and PS_PAD_I/O. |
| SOM Connector Power Pins | Updated the VBATT recommended conditions in SOM Power Rails. Added discussion on connecting unused I/O bank VCCO pins. |
| Power Management | Added further details on power management and PWRGD signals. |
| SOM Power Estimation | Added link to Kria K26 SOM Thermal Design Guide (UG1090). |
| Carrier Card Board to Board Connector Placement Guideline for K26 SOM | Corrected Samtec mating connector model (ADM6–60–01.5–L–4–2–A). |
| References | Added link to Kria K26 SOM Thermal Design Guide (UG1090). |
| 4/20/2021 Version 1.0 | |
| Initial release. | N/A |