Specifications

Table of Contents
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342C) 4
Parallel Host Bus Timing Table.............................................................................................................................48
SocketModem Parallel Interface ...........................................................................................................................49
Overview........................................................................................................................................................49
Transmitter FIFO Interrupt Operation.............................................................................................................49
Register Functional Definitions ......................................................................................................................50
IER – Interrupt Enable Register .....................................................................................................................51
FCR – FIFO Control Register ........................................................................................................................52
IIR – Interrupt Identifier Register....................................................................................................................53
LCR – Line Control Register ..........................................................................................................................54
MCR – Modem Control Register....................................................................................................................55
LSR – Line Status Register............................................................................................................................56
MSR – Modem Status Register .....................................................................................................................57
RBX – RX Buffer (Receiver Buffer Register)..................................................................................................57
THR – TX Buffer (Transmitter Holding Register) ...........................................................................................57
SCR – Scratch Register.................................................................................................................................58
Divisor Registers............................................................................................................................................58
Application Notes ..................................................................................................................................................59
Tip and Ring Interface....................................................................................................................................59
Microphone and Speaker...............................................................................................................................60
Recommended Parts .....................................................................................................................................61
Chapter 3 – SocketModem (MT5634SMI-34 & MT5634SMI-92) ...............................................................................63
Introduction ...........................................................................................................................................................63
Product Ordering Information................................................................................................................................63
Developer Kit ........................................................................................................................................................63
Technical Specifications .......................................................................................................................................64
SocketModem Configuration.................................................................................................................................66
Serial Configuration .......................................................................................................................................66
Parallel Configuration.....................................................................................................................................67
Electrical Characteristics.......................................................................................................................................68
3.3 V Serial – Industrial Temperature (SMI-ITP) Build Option .......................................................................68
3.3 V Parallel – Standard (SMI) and Industrial Temperature (SMI-ITP) Build Options...................................68
5 V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options.....................................................68
5 V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options ..................................................68
Timing Requirements............................................................................................................................................69
SocketModem Parallel Interface Internal Registers ..............................................................................................70
Overview........................................................................................................................................................70
Register Functional Definitions ......................................................................................................................72
RBR – Receive Buffer (RX FIFO) ..................................................................................................................73
THR – Transmit Holding Register (TX FIFO) .................................................................................................73
IER – Interrupt Enable ...................................................................................................................................73
IIR – Interrupt Identification (Read Only)........................................................................................................73
FCR – FIFO Control.......................................................................................................................................74
LCR – Line Control ........................................................................................................................................74
MCR – Modem Control ..................................................................................................................................74
LSR – Line Status..........................................................................................................................................75
MSR – Modem Status....................................................................................................................................75
SCR – Scratch ...............................................................................................................................................76
DLL – Divisor Latch (LSByte).........................................................................................................................76
DLM – Divisor Latch (MSByte).......................................................................................................................76
Application Notes ..................................................................................................................................................77
Tip and Ring Interface....................................................................................................................................77
Recommended Parts .....................................................................................................................................78