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VM4016 Theory of Operation 89
RELAYDATA
RELAYUPDATE
RELAYCLK
RELAYENA*
CONTROL
U3
BA 0-5, 29
U15
U16
+
-
10pf
2K
6K
100K
10K
100K
100K
+CH1
-CH1
U17A
SEROUT
SERIN
VCC
K9:A
K9:B
100K
10K
K9:C
U1
U4
RELAY
DRIVER
RELAY
DRIVER
DATA
BUFFER
DATA
VMIP BUS
FROM FRONT
PANEL CONNECTORS
COMMAND
BUFFER
FPGA
TO U13A
TO
RELAY
COILS
FIGURE 5-1: INPUT RANGE SELECTION