22
Flow chart
Start
Start
DAV is
set to Hi.
NRFD and
NDAC are set
to Lo.
Are both
NRFD and
NDAC Hi?
Ready to
receive
data?
New signal
to DIO
Delay until
stabilizing
NRFD is
set to Hi.
Error display
End
Is NRFD
Hi?
DAV is set
to Lo.
Is NDAC
Hi?
DAV is set
to Hi.
Are there
other data?
End
Source
Hi: High level
Lo: Low level
Is DAV
Lo?
NRFD is
set to Lo.
Receives
DIO signal.
NDAC is
set to Hi.
Is DAV Hi?
NDAC is
set to Lo.
YES
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NRFD goes Hi
only when all
acceptors are
ready.
Data go valid.
Ready to receive
them.
NDAC stays Lo
until all acceptors
receive data.
Hereinafter, data
are invalid.
①
②
③
③ ⑪
⑫
④
⑥ ⑯
⑩ ⑳
⑮
⑭
⑤
⑦ ⑰
⑧
⑬
⑲
⑱
⑨
22