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型號(hào)：	SC-80C32E-30/883
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 30 MHz, MICROCONTROLLER, CDIP40
封裝：	SIDE BRAZED, DIP-40
文件頁(yè)數(shù)：	80/1021頁(yè)
文件大小：	15196K
代理商：	SC-80C32E-30/883

32072H–AVR32–10/2012

AT32UC3A3

At the end of the current access, if no other request is pending, the slave remains connected to

its associated default master. A slave can be associated with three kinds of default masters: no

default master, last access master and fixed default master.

No Default Master

At the end of the current access, if no other request is pending, the slave is disconnected from

all masters. No Default Master suits low-power mode.

Last Access Master

At the end of the current access, if no other request is pending, the slave remains connected to

the last master that performed an access request.

Fixed Default Master

At the end of the current access, if no other request is pending, the slave connects to its fixed

default master. Unlike last access master, the fixed master does not change unless the user

modifies it by a software action (field FIXED_DEFMSTR of the related SCFG).

To change from one kind of default master to another, the Bus Matrix user interface provides the

Slave Configuration Registers, one for each slave, that set a default master for each slave. The

Slave Configuration Register contains two fields: DEFMSTR_TYPE and FIXED_DEFMSTR. The

2-bit DEFMSTR_TYPE field selects the default master type (no default, last access master, fixed

default master), whereas the 4-bit FIXED_DEFMSTR field selects a fixed default master pro-

vided that DEFMSTR_TYPE is set to fixed default master. Please refer to the Bus Matrix user

interface description.

Arbitration

The Bus Matrix provides an arbitration mechanism that reduces latency when conflict cases

occur, i.e. when two or more masters try to access the same slave at the same time. One arbiter

per HSB slave is provided, thus arbitrating each slave differently.

The Bus Matrix provides the user with the possibility of choosing between 2 arbitration types for

Round-Robin Arbitration (default)

Fixed Priority Arbitration

This choice is made via the field ARBT of the Slave Configuration Registers (SCFG).

Each algorithm may be complemented by selecting a default master configuration for each

When a re-arbitration must be done, specific conditions apply. See Section 13.4.2.1 ”Arbitration

Arbitration Rules

Each arbiter has the ability to arbitrate between two or more different master requests. In order

to avoid burst breaking and also to provide the maximum throughput for slave interfaces, arbitra-

tion may only take place during the following cycles:

Idle Cycles: When a slave is not connected to any master or is connected to a master

which is not currently accessing it.

Single Cycles: When a slave is currently doing a single access.

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