125
Table 4.4
Data Buses Used and Valid Strobes
Area
Access
Size
Read/
Write
Address
Valid
Strobe
Upper Data Bus
(D15 to D8)
Lower Data Bus
(D7 to D0)
8-bit access
Byte
Read
—
RD
Valid
Invalid
space
Write
—
HWR
Hi-Z
16-bit access
Byte
Read
Even
RD
Valid
Invalid
space
Odd
Invalid
Valid
Write
Even
HWR
Valid
Hi-Z
Odd
LWR
Hi-Z
Valid
Word
Read
—
RD
Valid
Valid
Write
—
HWR
,
LWR
Valid
Valid
Note:
Hi-Z: High-impedance state
Invalid: Input state; input value is ignored.
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