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6- 8 M68040 USER’S MANUAL MOTOROLA
OUTPUT CONTROL
FROM SYSTEM LOGIC
FROM
LAST
CELL
CLOCK DR
SHIFT DR TO NEXT CELL
TO OUTPUT
BUFFER
(1 = DRIVE)
1 = EXTEST
0 = OTHERWISE
1D
C1
1
MUX
1
G1
1
MUX
1
G1
UPDATE DR
1D
C1
R
RESET
Figure 6-5. Output Control Cells (IO.Ctl)
FROM
LAST CELL
OUTPUT 
DATA
INPUT 
DATA
OUTPUT
ENABLE
TO NEXT CELL
TO NEXT
PIN PAIR
I/O.CTL
O.LATCH
I.PIN
EN INPUT
PIN
Figure 6-6. General Arrangement of Bidirectional Pins
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