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请教PCI9052引脚“BTERM#”的接法
各位9052 前辈,
我对“BTERM#”引脚的接法一直不太清楚。9052 data book 2.0 中的描述如下: If disabled through the PCI 9052 Configuration registers, the PCI 9052 bursts up to four transactions, Lword transfer depends upon the bus width and type. If enabled, the PCI 9052 continues to burst until BTERM# input is asserted. BTERM# is a ready input that breaks up a Burst cycle and causes another Address cycle to occur. BTERM# is not sampled until internal wait states expire. LRDYi# is ignored when BTERM# is enabled andasserted. BTERM# is not sampled until external wait states expire [WAITO# de-asserted, provided USER0/WAITO# is configured as WAITO# (CNTRL[0]=1)]. 在接上拉电阻方面描述是: Internal 80K-Ohm pull-up; if used, add external pull-up 我想问一问各位高人,如果不使用BTERM#的功能,按照上面的说法,就不用接上拉电阻了;;如果使用的话,就接上拉电阻,是这样么? 但是上面已经说过,9052内部已经有一个80k的上拉电阻了呀! 多谢了! |
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沙发#
发布于:2003-11-06 10:25
最好一句说了啊,如果使用的话就要加上拉电阻。如果你不使用的话,可以接高电平就可以了
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板凳#
发布于:2003-11-17 19:09
问:不使用的时候需要接高电平吗?
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