STPCI2 查看數據表（PDF） - STMicroelectronics
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STPCI2 Datasheet PDF : 108 Pages
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STPC® ATLAS
6.3.6. IPC
Most of the IPC signals are multiplexed: Interrupt
inputs, DMA Request inputs, DMA Acknowledge
outputs. The figure below describes a complete
implementation of the IRQ[15:0] time-multiplexing.
Figure 6-11. Typical IRQ multiplexing
When an interrupt line is used internally, the
corresponding input can be grounded. In most of
the embedded designs, only few interrupts lines
are necessary and the glue logic can be simplified.
74x153
Timer 0
IRQ[0]
1C0
Keyboard
Slave PIC
IRQ[1]
IRQ[2]
1C1 1Y
1C2
IRQ_MUX[0]
COM2/COM4
IRQ[3]
1C3
COM1/COM3
) LPT2
t(s Floppy
LPT1
solete Produc RTC
t(s) - Ob Mouse
c FPU
u PCI / IDE
Obsolete Prod PCI / IDE
IRQ[4]
IRQ[5]
IRQ[6]
IRQ[7]
2C0
2C1 2Y
2C2
2C3
A
B
1G 2G
Floppy
IRQ[8]
IRQ[9]
IRQ[10]
IRQ[11]
IRQ[12]
IRQ[13]
IRQ[14]
IRQ[15]
ISA_CLK2X
ISA_CLK
74x153
1C0
1C1 1Y
1C2
1C3
2C0
2C1 2Y
2C2
2C3
A
B
1G 2G
IRQ_MUX[1]
IRQ_MUX[2]
IRQ_MUX[3]
When the interface is integrated into the STPC,
the corresponding interrupt line can be grounded
as it is connected internally.
For example, if the integrated IDE controller is
activated, the IRQ[14] and IRQ[15] inputs can be
grounded.
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