LPC47M14X datasheet(73/205 Pages) SMSC

73 / 205 page

SMSC DS – LPC47M14X

Page 73

Rev. 03/19/2001

6.8

MPU-401 MIDI UART

6.8.1

Overview

Serial Port 3 is used exclusively in the LPC47M14x as an MPU-401-compatible MIDI Interface. The LPC47M14x

MPU-401 hardware includes a Host Interface, an MPU-401 command controller, configuration registers, and a

compatible UART (FIGURE 3).

Each of these components are discussed in detail, below.

Only the MPU-401 UART (pass-through) mode is included in this implementation.

MPU-401 UART mode is

supported on the Sound Blaster 16 Series-compatible MIDI hardware. The Sound Blaster 16 hardware is supported

by Microsoft Windows Operating Systems.

In MPU-401 UART mode, data is transferred without modification between the host and the MIDI device (UART).

Once UART mode is entered using the UART MODE command (3Fh), the only MPU-401 command that the interface

recognizes is RESET (FFh).

HOST

INTERFACE

IRQ

SA[15:0]

SD[7:0]

UART

MIDI_IN

MIDI_OUT

MPU-401

COMMAND

CONTROLLER

nIOR

nIOW

CONFIGURATION

REGISTERS

FIGURE 3 – MPU-401 MIDI INTERFACE

Note:

This figure is for illustration purposes only and is not intended to suggest specific implementation

details.

6.8.2

Host Interface

Overview

The Host Interface includes two contiguous 8-bit run-time registers (the Status/Command Port and the Data Port),

and an interrupt. For illustration purposes, the Host Interface block shown in FIGURE 3 uses standard ISA signaling.

Address decoding and interrupt selection for the Host Interface are determined by device configuration registers (see

Section “MPU-401Configuration Registers”).

I/O Addresses

The Sound Blaster 16 MPU-401 UART mode MIDI interface requires two consecutive I/O addresses with possible

base I/O addresses of 300h and 330h. The default is 330h. The LPC47M14x MPU-401 I/O base address is

programmable on even-byte boundaries throughout the entire I/O address range (see Section “Activate and I/O Base

address”).

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