HT6576 查看數據表（PDF） - Holtek Semiconductor

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HT6576

Advanced SCSI CHIP

Holtek Semiconductor 

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

7

14th July ’97

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