Spectrum Digital eZdsp R2812 USB Technical Reference page 15

2.1.1 Power Connector
The eZdsp
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.
TM
2.2 eZdsp R2812 Memory
The eZdsp includes the following on-chip memory:
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.
TM
R2812 is powered by a 5-Volt only power supply, included with the
• 2 blocks of 4K x 16 single access RAM (SARAM)
• 1 block of 8K x 16 SARAM
• 4 blocks of 1K x 16 SARAM
Table 1: External Chip Select and Usage
Chip Select
Signal
XZCS0AND1n
XZCS2n
XZCS6AND7n
Use
Expansion header
Expansion Header
External SRAM
Spectrum Digital, Inc
2-3