STPCE1HDBC datasheet(67/87 Pages) STMICROELECTRONICS

67 / 87 page

DESIGN GUIDELINES

Release 1.3 - January 29, 2002

67/87

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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 6-10. Typical IRQ multiplexing

74x153

1C0

IRQ[0]

IRQ_MUX[0]

1C1

1C2

1C3

2C0

2C1

2C2

2C3

IRQ_MUX[1]

IRQ[1]

IRQ[2]

IRQ[3]

IRQ[4]

IRQ[5]

IRQ[6]

IRQ[7]

74x153

1C0

IRQ_MUX[2]

1C1

1C2

1C3

2C0

2C1

2C2

2C3

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

Floppy

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