https://community.nxp.com/t5/LPC-Microcontrollers/LPCXpresso54628-Development-Board-SDRAM-addressing/m-p/2041201#M57661 <P>I am using the documentation for the LPCXpress54628 development board as a guide to replicate the interface with the SDRAM IC IS42S16800F-6BLI in my own design.&nbsp; I noticed on the diagram that there is a&nbsp;P1_24-EMC_A12 identified connected to pin G1.&nbsp; However, the datasheet for that device shows pin G1 as NC.&nbsp; I will assume it really isn't a functioning connection.&nbsp; The 12 address lines A0-A11 do provide the 4K of addressing for the memory.&nbsp; Was there a part change?&nbsp; The other part number (W9812G6JB) also shows NC on G1.</P><P>Thanks</P><P>Sam</P> Mon, 10 Feb 2025 22:05:16 GMT samv 2025-02-10T22:05:16Z https://community.nxp.com/t5/LPC-Microcontrollers/LPCXpresso54628-Development-Board-SDRAM-addressing/m-p/2041201#M57661 <P>I am using the documentation for the LPCXpress54628 development board as a guide to replicate the interface with the SDRAM IC IS42S16800F-6BLI in my own design.&nbsp; I noticed on the diagram that there is a&nbsp;P1_24-EMC_A12 identified connected to pin G1.&nbsp; However, the datasheet for that device shows pin G1 as NC.&nbsp; I will assume it really isn't a functioning connection.&nbsp; The 12 address lines A0-A11 do provide the 4K of addressing for the memory.&nbsp; Was there a part change?&nbsp; The other part number (W9812G6JB) also shows NC on G1.</P><P>Thanks</P><P>Sam</P> Mon, 10 Feb 2025 22:05:16 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPCXpresso54628-Development-Board-SDRAM-addressing/m-p/2041201#M57661 samv 2025-02-10T22:05:16Z https://community.nxp.com/t5/LPC-Microcontrollers/LPCXpresso54628-Development-Board-SDRAM-addressing/m-p/2041703#M57666 <P>Hi <a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/89562">@samv</a>&nbsp;</P> <P><SPAN>Yes, The W9812G6JB</SPAN> and <SPAN>IS42S16800F-6BLI</SPAN> both have only 12 bit address lines.</P> <P>They are&nbsp;128Mb SDRAM.</P> <P>You can also check the LPC54628 RM.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Harry_Zhang_0-1739270013304.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/323398i130D56BF8FB721F8/image-size/medium?v=v2&amp;px=400" role="button" title="Harry_Zhang_0-1739270013304.png" alt="Harry_Zhang_0-1739270013304.png" /></span></P> <P>&nbsp;</P> <P>BR</P> <P>Harry</P> Tue, 11 Feb 2025 10:33:46 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPCXpresso54628-Development-Board-SDRAM-addressing/m-p/2041703#M57666 Harry_Zhang 2025-02-11T10:33:46Z