Zilog EZ80L92 Bedienungsanleitung PDF herunterladen (Seite 34)

eZ80L92 Development Kit

User Manual

Operational Description UM012913-0407

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 the U.S. requires modification.

The tested modem for this

eZ80L92 Development Kit

is a Conexant socket

modem, part number SF56D/SP. Information about this modem and its inter-

face is available in the SmartSCM SocketModem data sheet (Doc. No.

101522D) from

www.conexant.com

eZ80

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-

29 PC7_RI1 Ring Indicator interface; TTL levels.

30 PC0_TXD1 TxD interface; TTL levels.

31 PC1_RXD1 RxD interface; TTL levels.

32 PC2_RTS1 RTS interface; TTL levels.

Table 12. Connector J1

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 85 86

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Zilog EZ80L92 Bedienungsanleitung Seite 34