HT6576A
Interrupts
SELECTION/RESELECTION
• SEL= ACTIVE LOW
• BSY IS FALSE FOR AT LEAST 400NS
• HT6576A DEVICE ID (SELECT REGISTER) is active on the SCSI bus will generate IRQ.
END OF PROCESS (EOP) INTERRUPT
• EOP= ACTIVE LOW
• DACK= ACTIVE LOW
• IOR OR IOW= ACTIVE LOW
• DMA MODE
• ENABLE EOP IRQ⇒ GENERATE EOP IRQ
SCSI BUS RST/IRQ
When An SCSI RST active low, the IRQ is generated.
PARITY ERROR IRQ
An IRQ is generated for a received parity error if enable parity checking bit and the enable
parity interrupt bit are set.
BUS PHASE MISMATCH IRQ
If the DMA MODE bit is active and a phase mismatch occurs when REQ from false to true,
an interrupt is generated
LOSS OF BSY/IRQ
• MONITOR BSY bit= 1
• BSY= ACTIVE LOW FOR 400ns WILL GENERATE IRQ
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14th July ’97