TMPR3911 datasheet(241/462 Pages) TOSHIBA

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Chapter 11 Magicbus Module

11-1

11. Magicbus Module

11.1 Overview

Magic Port is a multifunction expansion port for a wide range of serial peripheral connections. Magicbus

is a serial interface standard which includes an advanced communications protocol for interfacing to low-

cost and low-power daisy-chainable peripherals and docks. The Magicbus implementation is intended to

support peripherals such as scanners, modems, battery chargers, base stations (including intelligent

answering machines, telephones, fast chargers, etc.), storage devices, etc. Magicbus features high-speed data

transfer rates (up to 14.75 Mbps), daisy-chainable peripherals (up to 6 maximum), and hot plugging. A low-

cost Magicbus Interface Circuit (MBIC) is also available for use in peripherals. This interface can be

implemented as a discrete circuit, as a standalone ASIC, or integrated with a microcontroller core (e.g.,

68HC05 type).

Magicbus consists of a synchronous, serial two-wire (clock and data), half-duplex communications

protocol. The clock and data signals are bi-directional, such that the TMPR3911/12 Magicbus Module can be

dynamically configured as the bus master or slave at a given time. The protocol also includes an interrupt

source for initiating all peripheral servicing, as well as when peripherals have been attached to or detached

from the bus. TMPR3911/12’s Magicbus Module contains independent transmitter and receiver logic to

implement the half-duplex serial data transfer, with DMA support provided for both the transmit and receive

directions. The independent transmitter and receiver allow a peripheral to control the data rate of the

receiving shift register, since the receiver uses the peripheral’s transmit clock as it’s clock source.

11.1.1

Related Pins

MBUSCLK:

INPUT/OUTPUT

This pin is the bi-directional Magicbus clock signal. MBUSCLK is an input signal whenever the

TMPR3911/12 is in the slave mode and is an output signal whenever the TMPR3911/12 is in the

master mode.

MBUSDATA:

INPUT/OUTPUT

This pin is the bi-directional Magicbus data signal. MBUSDATA is an input signal whenever the

TMPR3911/12 is in the slave mode and is an output signal whenever the TMPR3911/12 is in the

master mode.

MBUSINT:

INPUT

This pin is the Magicbus interrupt signal. This signal is used to interrupt the TMPR3911/12

whenever a peripheral has been attached to or detached from the bus, or whenever a peripheral has

initiated an interrupt event.

TMPR3911 Datasheet(PDF) 241 Page - Toshiba Semiconductor