Zilog eZ80F92 - Manual (Page 35)

eZ80F92 Development Kit
User Manual
UM013911-0607 Operational Description
31
Components P4, T1, C3, C4, and U11 provide the phone line interface to
the modem. On the eZ80Acclaim!
® Development Platform, LEDs D1,
D2, D3, and D4 function as status indicators for this optional modem.
The phone line connection for the modem is for the United States only.
Connecting the modem outside of the U.S. requires modification.
The tested modem for this eZ80F92 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 17. Information about
this modem and its interface is available in the SocketModem data sheet
from
www.multitech.com .
eZ80Acclaim! ® Development Platform Memory
Memory space on the eZ80Acclaim! ® Development Platform consists of
onboard SRAM and additional SRAM 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
. With the 512 KB of SRAM on the eZ80F92 Flash Module, this
addressing structure provides 1 MB of contiguous SRAM for immediate
use. Chip Select 2 is used to access the 512 KB of SRAM on the
eZ80Acclaim!
® Development Platform.
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