MC68020 Motorola, MC68020 Datasheet - Page 57

• Manufacturer Part Number: MC68020
• Description: (MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
• Manufacturer: Motorola

Figure 5-5 shows the transfer (write) of a long-word operand to a word port. In the first bus
cycle, the MC68020/EC020 places the four operand bytes on the external bus. Since the
address is long-word aligned in this example, the multiplexer follows the pattern in the
entry of Table 5-5 corresponding to SIZ0, SIZ1, A0, A1 = 0000. The port latches the data
on D31–D16, asserts DSACK1 (DSACK0 remains negated), and the processor terminates
the bus cycle. It then starts a new bus cycle with SIZ1, SIZ0, A1, A0 = 1010 to transfer the
remaining 16 bits. SIZ1 and SIZ0 indicate that a word remains to be transferred; A1 and
A0 indicate that the word corresponds to an offset of two from the base address. The
multiplexer follows the pattern corresponding to this configuration of SIZ1, SIZ0, A1, and
A0 and places the two least significant bytes of the long word on the word portion of the
bus (D31–D16). The bus cycle transfers the remaining bytes to the word-sized port. Figure
5-6 shows the timing of the bus transfer signals for this operation.
5-10
31
D31
Figure 5-5. Long-Word Operand Write to Word Port Example
OP0
MSB
OP0
OP2
WORD MEMORY
DATA BUS
OP3
LSB
OP1
OP1
LONG-WORD OPERAND
M68020 USER’S MANUAL
D16
SIZ1
0
1
OP2
MC68020/EC020
SIZ0
0
0
A1
0
1
OP3
A0
0
0
DSACK1
0
MEMORY CONTROL
L
L
DSACK0
H
H
MOTOROLA