Zilog ZUSBOPTS - Manual (Page 344)

Program Configurations UM017105-0511
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Zilog Developer Studio II – ZNEO™
User Manual
Because RAM cannot retain values across power cycles, this configuration is meant for
development only. By using this configuration, you can avoid erasing and burning the exe-
cutable code in Flash multiple times as part of development cycle. In this respect, this con-
figuration obviously is very similar to the Download to ERAM Program Configuration
discussed in
Download to ERAM Program Configuration – see page 312. The main differ-
ence is that RAM is typically internal memory, while ERAM is external. Therefore, to use
the Download to ERAM Program Configuration, you must provide external memory and
configure its interface. By using the Download to RAM Program Configuration, you avoid
that task. On the other hand, the amount of internal memory is rather limited on many
Figure 134. Programmer’s Model—Download to RAM Program Configuration
EROM Data
Copy of ERAM Initializers
Copy of RAM Initializers
16-Bit
Addressable
Address
IODATA
ERAM
ROM
RAM
EROM
I/O Access
Small Model Stack
RAM Data
Large Model Stack
ERAM Data
ROM Data
Start-up Code
Vector Table
Option Bytes
Contents
Range (Space)
Code
(Data)
16-Bit
Addressable
(Data)