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AN036602-1013

Porting RZK/ZTP Applications to the eZ80L925148MODG Module

Application Note

CS0 Control

0x88

CS0 Bus Mode

0x82



The new eZ80L925148MODG Module is equipped with 8MB of Flash mapped to the

CS0. To avoid conflicts with SRAM memory that is mapped to the first 512KB to 1MB of

the eZ80L92 address space in RAM build configurations, the CS0 should continue to be

configured with a lower bound of 0x100000. This configuration would imply a CS0

upper bound of 0x8FFFFF on the eZ80L925148MODG Module.

However, be advised that when using the eZ80Acclaim! Development Platform

(99C0858) with the eZ80L925148MODG Module, the GPIO and LED matrix are mapped

into the CS2 memory at 0x800000. Also, the gate array logic on the eZ80Acclaim!

Development Platform limits the upper bound of the CS0 mapping to 0x7FFFFF. Conse-

quently, Zilog recommends the following CS0 settings for use with the

eZ80L925148MODG Module on the eZ80Acclaim! Development Platform for RAM

builds:

CS0 Lower Bound

0x100000

CS0 Upper Bound

0x7FFFFF

CS0 Control

0x88

CS0 Bus Mode

0x01



When using a Flash (or Copy to RAM) build configuration, the lower bound on the CS0 is

typically set to 0x00 and the chip selects for SRAM are configured such that the static

RAM is located above the highest memory address occupied by the external Flash.

eZ80Acclaim! Development Platform Jumper Changes

When using the eZ80L925148MODG Module with the eZ80Acclaim! Development Plat-

form, it is typically necessary to install Jumper J20. By default, the external chip select

signal on the eZ80Acclaim! Development Platform, nCS_EX, features a jumper in the 1–2

position of J19, which routes memory requests in the CS0 range of 0x400000 to

0x7FFFFF

to the eZ80Acclaim! Development Platform. As a result, access is prevented to

the upper 4MB of the external 8MB Flash space on the eZ80L925148MODG Module. To

maximize the amount of external Flash memory, the eZ80L92 MCU can access on the

eZ80L925148MODG Module. It is necessary to install a shunt on J20.

New ZTGT Files and Address Spaces

The AN0366–SC01_<version>.exe installation and later ZDSII – eZ80Acclaim!

releases include two new Zilog target (ZTGT) files for the eZ80L925148MODG Module.

These files are named eZ80L925148MODG_RAM.ztgt and

eZ80L925148MODG_Flash.ztgt

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