Zilog EZ80190 Manual de usuario descargar pdf (Pagina 35)

eZ80190 Development Kit

User Manual

UM014108-0810 Operational Description

eZ80Acclaim!

Development Platform Memory

Memory space on the eZ80Acclaim!

Development Platform consists of

onboard SRAM and additional footprints.

Onboard SRAM

The eZ80Acclaim!

Development Platform features 512 KB SRAM at

U20. This SRAM provides the basic memory requirement for small appli-

cations development. This SRAM is in the address range

B80000h–

BFFFFFh.

Additional SRAM

The amount of eZ80Acclaim!

Development Platform memory can be

extended if required by adding SRAM devices. U19, U18, and U17 pro-

vide this capability. However, the user should be aware that additional

SRAM must be installed in the following order:

1. U19, address range

B00000h–B7FFFFh

2. U18, address range A80000h–AFFFFFh

3. U17, address range A00000h–A7FFFFh

If SRAM memory is installed in a different order than the above

sequence, SRAM will not be contiguous unless the user is able to change

the address decoder, U10. Memory access decoding is performed by this

address decoder, implemented in the Generic Array Logic device,

GAL22LV10D (U10).

Memory Map

A memory map of the eZ80

CPU is illustrated in Figure 10. Flash mem-

ory and SRAM on the eZ80190 Module are addressed when

CS0

and

CS1

are active Low. SRAM on the

eZ80Acclaim!

Development Platform is

addressed when

CS2

is active Low.

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Zilog EZ80190 Manual de usuario Pagina 35

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