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I/O
BUS—
(I
ADDRESS
REGISTER
RANGE
REGISTER
.ADDRESS
TO
DDC
ZERO
DETECTER
I/O
BUS
OCC
SIGNALS-
SIGNALS-
NEW
WORD
REOUEST-
(
FROM
DEVICE)
OUTPUT DATA.
(FROM
CONTROLLER)
INPUT
DATA-
(FROM DEVICE)
INTERRUPT
AND
MASK
FF
'INTERRUPT
CONTROL
LOGIC
SYNC
LOGIC
DATA
BUFFER
REGISTER(S)
DDC
REQUEST, DIRECTION
.1/0
BUS
TEST
LINE
»NEW WORD
READY
(
TO
DEVICE)
.OUTPUT DATA
(TO
DEVICE)
.INPUT
DATA
(TO
CONTROLLER)
6426
Figure
4-5.
Example
2
of
a
DDC
Subchannel
4-10
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