Spectrum Digital eZdsp R2812 USB, Technical Reference, Page: 15 / 46

Spectrum Digital, Inc
2-3
2.1.1 Power Connector
The eZdsp
TM
R2812 is powered by a 5-Volt only power supply, included with the
unit. The unit requires 500mA. The power is supplied via connector P6. If expansion
boards are connected to the eZdsp, a higher amperage power supply may be
necessary. Section 2.3.6 provides more information on connector P6.
2.2 eZdsp
TM
R2812 Memory
The eZdsp includes the following on-chip memory:
• 2 blocks of 4K x 16 single access RAM (SARAM)
• 1 block of 8K x 16 SARAM
• 4 blocks of 1K x 16 SARAM
In addition 64K x 16 off-chip SRAM is provided. The processor on the eZdsp can be
configured for boot-loader mode or non-boot-loader mode.
For bootloading user code a 256K bit serial EEPROM is provided
The eZdsp can load ram for debug, or EEPROM can be loaded and run. For larger
software projects it is suggested to do a initial debug with on eZdsp R2812 module
which supports a total RAM environment. With careful attention to the I/O mapping in
the software the application code can easily be ported to the R2812.
The table below shows the external chip select signal and its use.
Table 1: External Chip Select and Usage
Chip Select
Signal
Use
XZCS0AND1n Expansion header
XZCS2n Expansion Header
XZCS6AND7n External SRAM