TMPR3911 datasheet(243/462 Pages) TOSHIBA

Part #	TMPR3911

Description	32-Bit TX System RISC TX39 Family

PDF	462 Pages

Scroll/Zoom	100%

Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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Chapter 11 Magicbus Module

11-3

11.2.3

Command Words

The Magicbus protocol dictates that when a Command Word is to be transmitted, the clock and data

signal functions are swapped, whereby MBUSDATA contains the clock signal and MBUSCLK contains

the data signal. This Swap Mode is used to differentiate Command Words from “raw data”. Each

peripheral MBIC contains circuitry which detects whenever the clock and data signal functions have

been swapped. The first 2 bits of each Command Word are Command Detection Bits which re-

synchronize the bus to reset the mode of any swapped clock/data lines and also prevent any past bus

errors from corrupting current and future data transmissions. Figure 11.2.3 shows a timing diagram of

the Command Word and the swapping of the clock and data signal functions.

COMMAND

DETECTION BITS

COMMAND WORD

(SWAPPED MODE)

PACKET

MBUSDATA

MBUSCLK

B15

Figure 11.2.3 Magicbus Command Word

TMPR3911 Datasheet(PDF) 243 Page - Toshiba Semiconductor