NB2DSK01 - Common-Bus SDRAM

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Modified by Admin on Sep 13, 2017

The NB2DSK01 includes Synchronous Dynamic RAM as part of the common-bus block of memory resources available to the NanoTalk Controller, or more specifically the firmware running within.

Figure 1. Common-bus SDRAM used by the
NB2DSK01s firmware.

The SDRAM is provided in the form of two MT48LC16M16A2TG devices (from Micron Technology). Each device is a 256Mbit, high-speed CMOS SDRAM, organized as 16M x 16 bits (4M x 16 bits x 4 banks) – combined together to give 16M x 32-bit storage (64MByte). Both devices are powered by the NB2DSK01's 3.3V supply.

Location on Board

The common-bus SDRAM devices (designated U25 and U26) are located on the component side of the board, to the right of the common-bus SRAM and within the real estate that falls beneath the TFT LCD panel.

Schematic Reference

The common-bus SDRAM devices can be found on Sheet 39 (SDRAM_MT48LC16M16A2TG_16Mx32.SchDoc, entitled 16M x 32 SDRAM TSOP54 x 2) of the motherboard schematics.

The common-bus memory block and interface wiring can be found on Sheet 36 (NB2_CommonMemory.SchDoc, entitled Common-Bus Memory Block).

Further Device Information

For more information on the MT48LC16M16A2TG device, refer to the datasheet (256MSDRAM.pdf) available at www.micron.com.