Specifications

Table of Contents
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 6
Electrical Characteristics...................................................................................................................................57
3.3V Serial SocketModem .............................................................................................................................57
3.3 V Parallel SocketModem..........................................................................................................................57
5V Serial SocketModem ................................................................................................................................57
5V Parallel SocketModem..............................................................................................................................57
Parallel Host Bus Timing Table .........................................................................................................................58
SocketModem Parallel Interface........................................................................................................................59
Overview........................................................................................................................................................59
Register Functional Definitions ......................................................................................................................60
IER – Interrupt Enable Register.....................................................................................................................61
FCR – FIFO Control Register ........................................................................................................................62
IIR – Interrupt Identifier Register....................................................................................................................63
LCR – Line Control Register..........................................................................................................................64
MCR – Modem Control Register....................................................................................................................65
LSR – Line Status Register............................................................................................................................66
MSR – Modem Status Register .....................................................................................................................67
RBX – RX Buffer (Receiver Buffer Register)..................................................................................................67
THR – TX Buffer (Transmitter Holding Register) ...........................................................................................67
SCR – Scratch Register.................................................................................................................................68
Divisor Registers............................................................................................................................................68
Application Notes ...............................................................................................................................................69
Tip and Ring Interface....................................................................................................................................69
Microphone and Speaker...............................................................................................................................70
Chapter 3 – SocketModem (MT5634SMI & MT9234SMI) .........................................................................................72
Introduction.........................................................................................................................................................72
Product Ordering Information............................................................................................................................72
Technical Specifications for MT5634SMI and MT9234SMI ..............................................................................73
SocketModem Configuration .............................................................................................................................75
Serial Configuration .......................................................................................................................................75
Parallel Configuration.....................................................................................................................................76
Electrical Characteristics...................................................................................................................................77
3.3V Serial – Industrial Temperature (SMI-ITP) Build Option ........................................................................77
3.3V Parallel – Industrial Temperature (SMI-ITP) Build Options....................................................................77
5V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options......................................................77
5V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options...................................................77
Parallel Timing Requirements............................................................................................................................78
SocketModem Parallel Interface Internal Registers.........................................................................................79
Overview........................................................................................................................................................79
Register Functional Definitions ......................................................................................................................81
RBR – Receive Buffer (RX FIFO) ..................................................................................................................82
THR – Transmit Holding Register (TX FIFO).................................................................................................82
IER – Interrupt Enable ...................................................................................................................................82
IIR – Interrupt Identification (Read Only)........................................................................................................82
FCR – FIFO Control.......................................................................................................................................83
LCR – Line Control ........................................................................................................................................83
MCR – Modem Control ..................................................................................................................................83
LSR – Line Status..........................................................................................................................................84
MSR – Modem Status....................................................................................................................................84
SCR – Scratch...............................................................................................................................................85
DLL – Divisor Latch (LSByte).........................................................................................................................85
DLM – Divisor Latch (MSByte).......................................................................................................................85
Application Notes ...............................................................................................................................................86
Tip and Ring Interface....................................................................................................................................86