Zilog ZUSBOPTS - Manual (Page 351)

UM017105-0511 Program Configurations
Zilog Developer Studio II – ZNEO™
User Manual
323
In this respect, this configuration obviously is very similar to the Copy to ERAM Program
Configuration discussed in
Copy to ERAM Program Configuration – see page 318. The
main difference is that RAM is typically internal memory, while ERAM is external.
Therefore, to use the Copy to ERAM Program Configuration, you must provide external
memory and configure its interface. By using the Copy to RAM Program Configuration,
you avoid that work. On the other hand, the amount of internal memory is rather limited
on many ZNEO devices, so the Copy to RAM Program Configuration might tend to be
limited to small applications or portions of applications during development.
Figure 136. Programmer’s Model—Copy to RAM Program Configuration
EROM Data
Copy of Code
Copy of ERAM 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)
Copy of RAM Initializers
Code
(Data)
16-Bit
Addressable
(Data)