首先DM9000A的INT 只是默认为高电平有效;
楼主认真看下对应的技术手册就会发现:
1、
INT O,PD
Interrupt Request
This pin is high active at default, its polarity can be modified by EEPROM
setting or by strap pin EECK. See the EEPROM content description for
detail
2、
EECK O,PD
Clock to EEPROM
This pin is also used as the strap pin of the polarity of the INT pin
When this pin is pulled high, the INT pin is low active; otherwise the INT pin is
high active