Zilog EZ80F91 - Manual (Page 33)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
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The tested modem for this eZ80F91 Development Kit is a MultiTech Sys-
tems (formerly Conexant) socket modem, part number SC56H1. Either the
3.3 V or the 5.0 V version of the modem can be used. However, jumper J12
should be configured accordingly—see
Table 20 . Information about this
modem and its interface is available in the SocketModem data sheet from
www.multitech.com .
eZ80Acclaim! ® Development Kit Memory
Memory space on the eZ80Acclaim! Development Kit consists of
onboard SRAM and additional SRAM footprints.
Onboard SRAM
The eZ80Acclaim! Development Kit features 512 KB SRAM at U20.
This SRAM provides the basic memory requirement for small applica-
tions development. This SRAM is in the address range
B80000h–
BFFFFFh . With the 512 KB of SRAM on the eZ80F91 Module, this
addressing structure provides 1 MB of contiguous SRAM for immediate
use. The Chip Select 2 (CS2) signal is used to access the 512 KB of
SRAM on the eZ80Acclaim! Development Kit.
Additional SRAM
The amount of eZ80Acclaim! Development Kit memory can be extended
if required by adding SRAM devices. U19, U18, and U17 provide this
capability. However, ensure that additional SRAM is installed in the fol-
lowing 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 you are able to change the
address decoder, U10. Memory access decoding is performed by this