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STPC12GEYC Datasheet(PDF) 84 Page - STMicroelectronics |
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STPC12GEYC Datasheet(HTML) 84 Page - STMicroelectronics |
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84 / 111 page  DESIGN GUIDELINES 84/111 Issue 1.0 - July 24, 2002 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. 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. 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. Figure 6-11. Typical IRQ multiplexing 74x153 1C0 1Y 1G IRQ[0] IRQ_MUX[0] 1C1 1C2 1C3 2C0 2C1 2C2 2C3 A B 2G 2Y IRQ_MUX[1] IRQ[1] IRQ[2] IRQ[3] IRQ[4] IRQ[5] IRQ[6] IRQ[7] 74x153 1C0 1Y 1G IRQ_MUX[2] 1C1 1C2 1C3 2C0 2C1 2C2 2C3 A B 2G 2Y IRQ_MUX[3] IRQ[8] IRQ[9] IRQ[10] IRQ[11] IRQ[12] IRQ[13] IRQ[14] IRQ[15] ISA_CLK2X ISA_CLK Timer 0 Keyboard Slave PIC COM2/COM4 COM1/COM3 LPT2 LPT1 RTC Mouse FPU PCI / IDE PCI / IDE Floppy Floppy |
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