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型號：	E5550F-DOW
廠商：	ATMEL CORP
元件分類：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁數(shù)：	691/1069頁
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

34.7.4 Multi-master Mode

34.7.4.1 Definition

In multi-master mode, more than one master may handle the bus at the same time without data corruption by using

arbitration.

Arbitration starts as soon as two or more masters place information on the bus at the same time, and stops (arbitration is

lost) for the master that intends to send a logical one while the other master sends a logical zero.

As soon as arbitration is lost by a master, it stops sending data and listens to the bus in order to detect a stop. When the

stop is detected, the master that has lost arbitration may put its data on the bus by respecting arbitration.

Arbitration is illustrated in

Figure 34-23 on page 692

34.7.4.2 Different Multi-master Modes

Two multi-master modes may be distinguished:

TWI is considered as a Master only and will never be addressed.

TWI may be either a Master or a Slave and may be addressed.

Arbitration is supported in both multi-master modes.

TWI as Master Only

In this mode, TWI is considered as a Master only (MSEN is always at one) and must be driven like a Master with the

ARBLST (Arbitration Lost) flag in addition.

If arbitration is lost (ARBLST = 1), the user must reinitiate the data transfer.

If the user starts a transfer (ex.: DADR + START + W + Write in THR) and if the bus is busy, the TWI automatically waits

for a STOP condition on the bus to initiate the transfer (see

Figure 34-22 on page 692

The state of the bus (busy or free) is not indicated in the user interface.

TWI as Master or Slave

The automatic reversal from Master to Slave is not supported in case of a lost arbitration.

Then, in the case where TWI may be either a Master or a Slave, the user must manage the pseudo Multi-master mode

described in the steps below.

Program TWI in Slave mode (SADR + MSDIS + SVEN) and perform a Slave Access (if TWI is addressed).

If the TWI has to be set in Master mode, wait until TXCOMP flag is at 1.

Program the Master mode (DADR + SVDIS + MSEN) and start the transfer (ex: START + Write in THR).

As soon as the Master mode is enabled, TWI scans the bus in order to detect if it is busy or free. When the bus is

considered free, TWI initiates the transfer.

As soon as the transfer is initiated and until a STOP condition is sent, the arbitration becomes relevant and the

user must monitor the ARBLST flag.

If the arbitration is lost (ARBLST is set to 1), the user must program the TWI in Slave mode in case the Master that

won the arbitration wants to access the TWI.

If the TWI has to be set in Slave mode, wait until TXCOMP flag is at 1 and then program the Slave mode.

If the arbitration is lost and the TWI is addressed, the TWI will not acknowledge even if it is programmed in Slave

mode as soon as ARBLST is set to 1. Then, the Master must repeat SADR.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
E5550F-S8	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DIT	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DOW	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-FP008	制造商:未知廠家制造商全稱:未知廠家功能描述:TRANSPONDER\|CMOS\|SOP\|8PIN\|PLASTIC
E5552	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder

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