User's Manual

Table of Contents
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342D) 4
SocketModem Parallel Interface ...........................................................................................................................51
Overview........................................................................................................................................................51
Transmitter FIFO Interrupt Operation.............................................................................................................51
Register Functional Definitions ......................................................................................................................52
IER – Interrupt Enable Register .....................................................................................................................53
FCR – FIFO Control Register ........................................................................................................................54
IIR – Interrupt Identifier Register....................................................................................................................55
LCR – Line Control Register ..........................................................................................................................56
MCR – Modem Control Register....................................................................................................................57
LSR – Line Status Register............................................................................................................................58
MSR – Modem Status Register .....................................................................................................................59
RBX – RX Buffer (Receiver Buffer Register)..................................................................................................59
THR – TX Buffer (Transmitter Holding Register) ...........................................................................................59
SCR – Scratch Register.................................................................................................................................60
Divisor Registers............................................................................................................................................60
Application Notes ..................................................................................................................................................61
Tip and Ring Interface....................................................................................................................................61
Microphone and Speaker...............................................................................................................................62
Recommended Parts .....................................................................................................................................63
Chapter 3 – SocketModem (MT5634SMI-34 & MT5634SMI-92) ...............................................................................65
Introduction ...........................................................................................................................................................65
Product Ordering Information................................................................................................................................65
Developer Kit ........................................................................................................................................................65
Technical Specifications .......................................................................................................................................66
SocketModem Configuration.................................................................................................................................68
Serial Configuration .......................................................................................................................................68
Parallel Configuration.....................................................................................................................................69
Electrical Characteristics.......................................................................................................................................70
3.3 V Serial – Industrial Temperature (SMI-ITP) Build Option .......................................................................70
3.3 V Parallel – Standard (SMI) and Industrial Temperature (SMI-ITP) Build Options...................................70
5 V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options.....................................................70
5 V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options ..................................................70
Timing Requirements............................................................................................................................................71
SocketModem Parallel Interface Internal Registers ..............................................................................................72
Overview........................................................................................................................................................72
Register Functional Definitions ......................................................................................................................74
RBR – Receive Buffer (RX FIFO) ..................................................................................................................75
THR – Transmit Holding Register (TX FIFO) .................................................................................................75
IER – Interrupt Enable ...................................................................................................................................75
IIR – Interrupt Identification (Read Only)........................................................................................................75
FCR – FIFO Control.......................................................................................................................................76
LCR – Line Control ........................................................................................................................................76
MCR – Modem Control ..................................................................................................................................76
LSR – Line Status..........................................................................................................................................77
MSR – Modem Status....................................................................................................................................77
SCR – Scratch ...............................................................................................................................................78
DLL – Divisor Latch (LSByte).........................................................................................................................78
DLM – Divisor Latch (MSByte).......................................................................................................................78
Application Notes ..................................................................................................................................................79
Tip and Ring Interface....................................................................................................................................79
Recommended Parts .....................................................................................................................................80
Chapter 4 – SocketModem (MT2456SMI-22) ............................................................................................................82
Introduction ...........................................................................................................................................................82
Product Ordering Information................................................................................................................................82
Developer Kit ........................................................................................................................................................82
Technical Specifications .......................................................................................................................................83
SocketModem Configuration.................................................................................................................................85
Serial Configuration .......................................................................................................................................85
Electrical Characteristics.......................................................................................................................................86
3.3 V and 5 V Serial SocketModem ...............................................................................................................86
Applications Notes ................................................................................................................................................87