Zilog EZ80F916 - Manual (Page 27)

eZ80F91 Modular Development Kit
User Manual
UM017010-0112 eZ80F91 Module
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eZ80F91 Module
This section describes the eZ80F91 Module hardware and its interfaces
and key components, including the CPU, real-time clock and memory.
Functional Description
The eZ80F91 Module is a compact and high-performance module that has
been designed for the rapid development and deployment of embedded
systems. Despite its small footprint, the eZ80F91 Module provides a
CPU, Ethernet interface, SRAM and real-time clock. This module is pow-
ered by the eZ80F91 microcontroller, a member of the eZ80Acclaim!
product family.
eZ80F91 Module Operational Description
As a feature of the eZ80F91 Modular Development Kit, the purpose of
the eZ80F91 Module is to provide a design platform to enable the use of
such eZ80F91 device features as on-chip EMAC, SRAM and Flash.
Static RAM
The eZ80F91 Module features 128 KB of fast SRAM. Access speed is
typically 12 ns, allowing zero-wait-state operation at 50 MHz. With the
CPU operating at 50 MHz, SRAM can be accessed with zero wait states in
eZ80 Mode. CS1_CTL (CS1) can be set to
08h (no wait states).
The eZ80F91 Mini Enet Module is shipped with SRAM powered from
the same power supply as the eZ80F91 device. The SRAM can also be
powered separately with a battery.
To power SRAM from a battery, observe the following brief procedure:
1. Remove R15.