其内部集成了上电复位,看门狗定时器,电源电压监视和读存储器块锁(Block Lock)保护四种功能,这种组合降低了系统成本,减少了电路板空间和增加了可靠性,常用于公交报站器,考勤器,税控电子产品中。
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介绍X5045的特性,X5045把四种常用的功能:上电复位、看门狗定时器、电源电压监控和块锁(Block Lock )保护的串行EEPROM存储器组成在一个封装之内。.
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block lock state 块锁定状态
lock block 压块 ; 锁数据块 ; 锁定块
Block Lock TM 块锁定
rolling block lock 滚柱式闭锁机
Lock The Block 锁定方块 ; 断定方块
block 2 lock 块2锁定
lock and block system 联动闭塞器制
lock control block 锁控制块
When DB2 performs an index or table scan, DB2 will block on a row lock when it comes across an uncommitted row which another transaction has exclusively (X) locked.
DB2 在执行索引或表扫描时,如果遇到一个被另一个事务独占 (X) 锁定的未提交行,那么 DB2 将阻塞在行锁上。
With locking, if one thread attempts to acquire a lock that is already held by another thread, the thread will block until the lock becomes available.
使用锁定,如果一个线程试图获取其他线程已经具有的锁定,那么该线程将被阻塞,直到该锁定可用。
In fact, when this feature is enabled, and the INSERT operation requires a new or reused block, DB2 will take an exclusive (x) lock on the block in order to add it to the target cell.
实际上,当该特性被启用,并且INSERT操作要求一个新的或重用的块时,DB 2将在块上采用一个独占的(X)锁,以便将它添加到目标单元。
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