PC87410 datasheet(11/16 Pages) NSC

11 / 16 page

Relation Table for INTA INTB IRQ1415 with HEADER and channel IO base registers

Condition

Outcome

When chip is disabled (HEADER is ‘‘don’t care’’) and

IRQ14 off

the setting of channel 01 IO base register setting is

IRQ15 off

‘‘don’t care’’

INTA

off

INTB

off16

HEADER is absent (Note 1) chip is enabled and

IRQ14 off

the setting of channel 01 IO base register setting is

IRQ15 off

‘‘don’t care’’

INTA

inversion of CH0

INT if CH0

INT is not

masked by the bit0 of register 43h

Otherwise it is at TRI-STATE

INTB

inversion of CH1

INT if CH1

INT is not

masked by the bit0 of register 47h

Otherwise it is at TRI-STATE

HEADER is present chip is enabled

IRQ14 same value of CH0

INT if CH0

INT is not

Channel 0 IO is set at ‘‘primary IDE port’’

masked by the bit0 of register 43h

Otherwise it is at TRI-STATE

HEADER is present chip is enabled

INTA

inversion of CH0

INT if CH0

INT is not

Channel 0 IO is set at ‘‘other IO port’’

masked by the bit0 of register 43h

Otherwise it is at TRI-STATE

IRQ14 off

HEADER is present chip is enabled

IRQ15 same value of CH1

INT if CH1

INT is not

Channel 1 IO is set at ‘‘secondary IDE port’’

masked by the bit0 of register 47h

Otherwise it is at TRI-STATE

HEADER is present chip is enabled

INTA

inversion of CH1

INT if CH1

INT is not

Channel 1 IO is set at ‘‘other IO port’’

masked by the bit0 of register 47h

Otherwise it is at TRI-STATE

IRQ15 TRI-STATE

HEADER is present chip is enabled

IRQ14 TRI-STATE

Channel 0 is not primary port and

IRQ15 TRI-STATE

Channel 1 is not secondary port

INTA

Inversion of ORed value of CH0

INT and

CH1

INT if none of the CH0

INT and CH1

INT is

masked by the bit0 of their respective registers

Otherwise it is at TRI-STATE

Note

INTB

is always at TRI-STATE when HEADER is present

Note 1

HEADER absent means Logic Low

PC87410 bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI)

PC87410 bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

bảng dữ liệu tải về

Link URL