This document describes some of the issues that you may encounter when developing a full-speed USB application on NXP
This document provides guidance on developing full-speed USB applications and interfacing SDRAM memory with NXP's LPC18xx and LPC43xx microcontroller families. It details the External Memory Controller (EMC) capabilities and specific connectivity requirements.
| Supported Microcontroller Families | LPC18xx, LPC43xx |
|---|---|
| Supported Memory Types | RAM, ROM, Flash, SDR SDRAM |
| Unsupported Memory Types | DDR SDRAM, synchronous static memory |
| Data Bus Width | 8-bit, 16-bit, 32-bit |
| Maximum CPU Frequency (LPC43xx) | 204 MHz |
| Maximum CPU Frequency (LPC18xx) | 180 MHz |
The EMC supports asynchronous static memory devices like RAM, ROM, and Flash, as well as dynamic memories like SDR SDRAM.
No, the EMC does not support double data rate (DDR) SDRAMs or synchronous static memory devices.
The LPC43xx operate at up to 204 MHz, while the LPC18xx operate at up to 180 MHz.