Intel IXP42X 用户手册

Intel

®

 IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

DM

September 2006

388

Order Number: 252480-006US

• GPIT1R represents GPIO 0 through GPIO 7
• GPIT2R represents GPIO 8 through GPIO 15
• General-Purpose Interrupt Type Register 1 bits 0 through 2 represent GPIO0
• General-Purpose Interrupt Type Register 1 bits 3 through 5 represent GPIO2, … 
• General-Purpose Interrupt Type Register 1 bits 21 through 23 represent GPIO7
• General-Purpose Interrupt Type Register 2 bits 0 through 2 represent GPIO8
• General-Purpose Interrupt Type Register 2 bits 3 through 5 represent GPIO9, … 
• General-Purpose Interrupt Type Register 2 bits 21 through 23 represent GPIO15. 

The possible settings for each of the 3-bit registers are shown in 

.

The interrupt detection logic uses a pulse width of five 66

-

MHz clock cycles before an 

interrupt will occur when a GPIO input is configured as an active high or active low 

interrupt type. The length of four 66

-

MHz clocks was chosen to discriminate against 

small pulses and ensures that glitches are not detected in the active high and active 

low interrupts when configured in these two interrupt modes.

GPIT2R

GPIO15

Bit 23

Bit 22

Bit 21

Not used.

GPIO14

Bit 20

Bit 19

Bit 18

Not used.

GPIO13

Bit 17

Bit 16

Bit 15

Not used.

GPIO12

Bit 14

Bit 13

Bit 12

Reset to Active High

GPIO11

Bit 11

Bit 10

Bit 9

Reset to Active High

GPIO10

Bit 8

Bit 7

Bit 6

Reset to Active High

GPIO9

Bit 5

Bit 4

Bit 3

Reset to Active High

GPIO8

Bit 2

Bit 1

Bit 0

Reset to Active High

GPIT1R

GPIO7

Bit 23

Bit 22

Bit 21

Reset to Active High

GPIO6

Bit 20

Bit 19

Bit 18

Reset to Active High

GPIO5

Bit 17

Bit 16

Bit 15

Reset to Active High

GPIO4

Bit 14

Bit 13

Bit 12

Reset to Active High

GPIO3

Bit 11

Bit 10

Bit 9

Reset to Active High

GPIO2

Bit 8

Bit 7

Bit 6

Reset to Active High

GPIO1

Bit 5

Bit 4

Bit 3

Reset to Active High

GPIO0

Bit 2

Bit 1

Bit 0

Reset to Active High

0

0

0

Interrupt detected after GPIO is logic 1 for five 

66-MHz clocks

Active High

0

0

1

Interrupt detected after GPIO is logic 0 for five 

66-MHz clocks

Active Low

0

1

0

Interrupt detected after GPIO goes from an 

logic 0 to logic 1

Rising Edge

0

1

1

Interrupt detected after GPIO goes from an 

logic 1 to logic 0

Falling Edge

1

X

X

Interrupt detected after GPIO goes from an 

logic 1 to logic 0 or GPIO goes from logic 0 to 

logic 1

Transitional