Burst mode (computing)

本文转载至：http://en.wikipedia.org/wiki/Burst_mode_(photography)

注：burst mode查了一下中文应可称为点放式，简言之，就是重复传输数据。

Burst mode (alternatively burst-mode) is a genericelectronics term referring to any situation in which a device is transmitting data repeatedly without going through all the steps required to transmit each piece of data in a separate transaction. The usual reason for having a burst mode capability, or using burst mode, is to increase data throughput.^[1] The steps left out while performing a burst mode transaction may include A: waiting for input from another device; B: waiting for an internal process to terminate before continuing the transfer of data; or C: transmitting information which would be required for a complete transaction, but which is inherent in the use of burst mode.^[2]

In the case of DMA, the DMA controller and the device are given exclusive access to the bus without interruption; the CPU is also freed from handling device interrupts.

The actual manner in which burst modes work varies from one type of device to another; however, devices that have some sort of a standard burst mode include the following:

• Random access memory (RAM), includingEDO, SDRAM, DDR SDRAM, and RDRAM; only the last three are required to send data in burst mode, according to industry standards
• Hard disk drive (HDD) interfaces such asSCSI andIDE
• Accelerated Graphics Port (AGP) devices; partially, as thewrite-combining is similar in purpose and meaning