Section 6 Bus Controller (BSC)
Rev. 1.00 Mar. 12, 2008 Page 128 of 1178
REJ09B0403-0100
6.5.3
Valid Strobes (in Glueless Extension)
Table 6.14 shows the data buses used and valid strobes for each access space.
The
RD
and
WR
signals are valid for both the upper and lower halves of the data bus. In a write,
the
HBE
signal is valid for the upper half of the data bus, and the
LBE
signal for the lower half.
Table 6.14 Data Buses Used and Valid Strobes (Gluless Extension)
Area
Access
Size
Read/
Write
Address
Valid
Strobe
Upper Data Bus
(D15 to D8)
Lower Data
Bus (D7 to D0)
Byte Read
—
RD
Valid
Ports or others
8-bit access
space
Write
—
WR
Byte Read
Even
RD
,
HBE
Valid
Invalid
Odd
RD
,
LBE
Invalid
Valid
Write
Even
WR
,
HBE
Valid
Undefined
Odd
WR
,
LBE
Undefined
Valid
Word Read —
RD
,
HBE
,
LBE
Valid Valid
16-bit access
space
Write
—
WR
,
HBE
,
LBE
[Legend]
Undefined:
Undefined data is output.
Invalid:
Input state with the input value ignored.
Ports or others: Used as ports or I/O pins for on-chip peripheral modules, and are not used as the
data bus.
Содержание H8S Family
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