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Handshaking mode of 8255 Emulation Ultra-Speed Digital Output
For the 8255 Emulation Ultra-Speed Digital Output, the PCI-1755 would like to transmit
the data to the external device; it will send a
DO_REQ
signal to external device. If the
external device is ready to get the data, it will also response a
DO_ACK
signal to PCI-1755
and then one unit of data will be transmitting from PCI-1755 to the external device.
Handshaking Mode of Ultra-speed Digital Output (8255 Emulation)
DO_REQ
DO_ACK
Data count
1
2
N-1
N
NOTE:
The
DO_REQ
and
DO_ACK
signal are shown as active low ONLY in handshaking mode
of 8255 Emulation.
Summary of Contents for PCI-1755
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Page 5: ...v 1 Introduction Chapter...
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Page 15: ...9 2 Installation Chapter...
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Page 33: ...27 Appendixes...
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