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STPCATLAS Folha de dados(PDF) 85 Page - STMicroelectronics

Nome de Peças STPCATLAS
Descrição Electrónicos  X86 Core PC Compatible System-on-Chip for Terminals
PDF  111 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPCATLAS Folha de dados(HTML) 85 Page - STMicroelectronics

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DESIGN GUIDELINES
Issue 1.0 - July 24, 2002
85/111
The
figure
below
describes
a
complete
implementation of the external glue logic for DMA
Request time-multiplexing and DMA Acknowledge
demultiplexing. Like for the interrupt lines, this
logic can be simplified when only few DMA
channels are used in the application.
This glue logic is not needed in Local bus mode as
it does not support DMA transfers.
Figure 6-12. Typical DMA multiplexing and demultiplexing
74x153
1C0
1Y
1G
DRQ[0]
DREQ_MUX[0]
1C1
1C2
1C3
2C0
2C1
2C2
2C3
A
B
2G
2Y
DREQ_MUX[1]
DRQ[1]
DRQ[2]
DRQ[3]
DRQ[4]
DRQ[5]
DRQ[6]
DRQ[7]
74x138
Y0#
A
G2B
DACK0#
Y1#
Y2#
Y3#
Y4#
Y5#
Y6#
Y7#
C
B
G2A
ISA_CLK2X
ISA_CLK
ISA, Refresh
ISA, PIO
ISA, FDC
ISA, PIO
Slave DMAC
ISA
ISA
ISA
G1
DMA_ENC[0]
DMA_ENC[1]
DMA_ENC[2]
DACK1#
DACK2#
DACK3#
DACK5#
DACK6#
DACK7#



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