NB2DSK01 - Common-Bus SRAM

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Modified by Admin on Sep 13, 2017

The NB2DSK01 includes Static 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 SRAM used by the
NB2DSK01's firmware.

The SRAM is provided in the form of two 4Mbit, high-speed CMOS SRAM devices. Each device is organized as 256K x 16 bits – combined together to give 256K x 32-bit storage (1MByte). Both devices are powered by the NB2DSK01's 3.3V supply.

Location on Board

The common-bus SRAM devices (designated U27 and U28) are located on the component side of the board, below the NanoTalk Controller (U5) and within the real estate that falls beneath the TFT LCD panel.

Schematic Reference

The common-bus SRAM devices can be found on Sheet 37 (SRAM_256Kx32_TSOP44_1.SchDoc, entitled 256K x 32 SRAM - TSOP44 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).