參數(shù)資料
型號: STPCC0166BTI3
廠商: STMICROELECTRONICS
元件分類: 外設(shè)及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA388
封裝: PLASTIC, BGA-388
文件頁數(shù): 54/71頁
文件大?。?/td> 1238K
代理商: STPCC0166BTI3
Obsolete
Product(s)
- Obsolete
Product(s)
DESIGN GUIDELINES
58/71
Issue 2.4 - November 8, 2001
6.2.3 IPC
Most of the IPC signals are multiplexed: Interrupt
inputs, DMA Request inputs, DMA Acknowledge
outputs. Figure 6-4 describes a complete imple-
mentation of the IRQ[15:0] time-multiplexing.
When an interrupt line is used internally, the corre-
sponding 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 ac-
tivated, the IRQ[14] and IRQ[15] inputs can be
grounded.
Figure 6-4. 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
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