Contec DIO-32DM3-PE, User Manual

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3. External Connection
DIO-32DM3-PE
37
(1) After setting the handshaking operation, this product samples the EXTREQ0 signal and starts
pattern input when it recognizes a low pulse of more than 50ns. Pattern data prior to that time is
disabled.
(2) The board generates a cycle to write data input from an external device to the PC memory by bus
mastering.
(3) At the end of writing data, the board outputs acknowledge signal EXTRACK0 to notify the external
device.
Output
tREQOL : EXTREQ1 low width 100ns
tACKOL : EXTACK1 low width 25ns (Min.)
Figure 3.9. Handshake Signals at the Time of Output
(1) After setting the handshaking operation, this product outputs the EXTREQ1 signal.
(2) The board begins sampling acknowledge signals from external devices. The board recognizes the
end with a low pulse of more than 25ns and, at the leading edge, starts preparing to output the next
data.
Valid
(1)
(2)
tACKOL
Next
tREQIL
EXTRAQ1 (Out)
DATA (Out)
EXTACK1 (In)