Specifications

Table of Contents
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342I) 6
5V Serial SocketModem ................................................................................................................................ 59
5V Parallel SocketModem .............................................................................................................................. 59
Parallel Host Bus Timing Table .......................................................................................................................... 60
SocketModem Parallel Interface ........................................................................................................................ 61
Overview ........................................................................................................................................................ 61
Register Functional Definitions ...................................................................................................................... 62
IER – Interrupt Enable Register ..................................................................................................................... 63
FCR – FIFO Control Register ......................................................................................................................... 64
IIR – Interrupt Identifier Register .................................................................................................................... 65
LCR – Line Control Register .......................................................................................................................... 66
MCR – Modem Control Register .................................................................................................................... 67
LSR – Line Status Register ............................................................................................................................ 68
MSR – Modem Status Register ...................................................................................................................... 69
RBX – RX Buffer (Receiver Buffer Register) .................................................................................................. 69
THR – TX Buffer (Transmitter Holding Register) ............................................................................................ 69
SCR – Scratch Register ................................................................................................................................. 70
Divisor Registers ............................................................................................................................................ 70
Application Notes ................................................................................................................................................ 71
Tip and Ring Interface .................................................................................................................................... 71
Microphone and Speaker ............................................................................................................................... 72
Chapter 3 – SocketModem (MT9234SMI) .................................................................................................................. 74
Introduction ......................................................................................................................................................... 74
Product Ordering Information ............................................................................................................................ 74
Technical Specifications .................................................................................................................................... 75
SocketModem Configuration ............................................................................................................................. 77
Serial Configuration ....................................................................................................................................... 77
Parallel Configuration ..................................................................................................................................... 78
Electrical Characteristics ................................................................................................................................... 79
5V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options ...................................................... 79
5V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options ................................................... 79
3.3V Serial – Industrial Temperature (SMI-L, SMI-ITP) Build Option ............................................................. 79
3.3V Parallel – Industrial Temperature (SMI-L, SMI-ITP) Build Options ........................................................ 79
Parallel Timing Requirements ............................................................................................................................ 80
SocketModem Parallel Interface Internal Registers ......................................................................................... 81
Overview ........................................................................................................................................................ 81
Register Functional Definitions ...................................................................................................................... 83
RBR – Receive Buffer (RX FIFO) .................................................................................................................. 84
THR – Transmit Holding Register (TX FIFO) ................................................................................................. 84
IER – Interrupt Enable ................................................................................................................................... 84
IIR – Interrupt Identification (Read Only) ........................................................................................................ 84
FCR – FIFO Control ....................................................................................................................................... 85
LCR – Line Control ........................................................................................................................................ 85
MCR – Modem Control .................................................................................................................................. 85
LSR – Line Status .......................................................................................................................................... 86
MSR – Modem Status .................................................................................................................................... 86
SCR – Scratch ............................................................................................................................................... 87
DLL – Divisor Latch (LSByte) ......................................................................................................................... 87
DLM – Divisor Latch (MSByte) ....................................................................................................................... 87
Application Notes ................................................................................................................................................ 88
Tip and Ring Interface .................................................................................................................................... 88
Chapter 4 – SocketModem (MT2492SMI) .................................................................................................................. 90
Introduction ......................................................................................................................................................... 90
Product Ordering Information ............................................................................................................................ 90
Technical Specifications .................................................................................................................................... 91
SocketModem Configuration ............................................................................................................................. 92
Serial Configuration ....................................................................................................................................... 92
Electrical Characteristics ................................................................................................................................... 92
3.3V Serial SocketModem.............................................................................................................................. 92
5V Serial SocketModem ................................................................................................................................ 92