Motorola MC68020 - Long-Word Read-16- and 32-Bit Ports

5- 30 M68020 USER’S MANUAL MOTOROLA
WORD READ
S0
S2
S4
S0
S2
S4
CLK
A31–A2
A1
A0
FC2–FC0
SIZ1
SIZ0
R/W
ECS
OCS
AS
DS
DSACK1
DSACK0
DBEN
D31–D24
D23–D16
WORD READ
D15–D8
D7–D0
S0
S2
S4
OP0
OP1
OP3
OP3
LONG WORD
WORD
LONG-WORD READ
FROM 32-BIT POR
T
OP2
OP1
OP0
OP2
LONG WORD
LONG-WORD OPERAND READ FROM 16-BIT PORT
**
**
**
*
*
For the MC68EC020, A23–A2.
This signal does not apply to the MC68EC020.
**
Figure 5-23. Long-Word Read—16- and 32-Bit Ports