Datasheet

Section 6 Bus Controller (BSC)
Rev. 2.00 Aug. 20, 2008 Page 130 of 1198
REJ09B0403-0200
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.