r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 246

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 9 Bus State Controller (BSC)
9.5
9.5.1
This LSI supports big endian, in which the 0 address is the most significant byte (MSB) in the byte
data.
The data bus width is 8 bits. Data alignment is performed in accordance with the data bus width of
the respective device. This also means that when longword data is read from a byte-width device,
the read operation must be done four times. In this LSI, data alignment and conversion of data
length are performed automatically between the respective interfaces.
Tables 9.6 show the relationship between device data width and access unit.
Table 9.6
Rev. 1.00 Sep. 21, 2007 Page 220 of 1124
REJ09B0402-0100
Operation
Byte access at 0
Byte access at 1
Byte access at 2
Byte access at 3
Word
access
at 0
Word
access
at 2
Longword
access
at 0
Operation
Endian/Access Size and Data Alignment
1st time
at 0
2nd time
at 1
1st time
at 2
2nd time
at 3
1st time
at 0
2nd time
at 1
3rd time
at 2
4th time
at 3
8-Bit External Device Access and Data Alignment
D15 to D8
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

Data Bus
D7 to D0
Data 7 to Data 0
Data 7 to Data 0
Data 7 to Data 0
Data 7 to Data 0
Data 15 to Data 8
Data 7 to Data 0
Data 15 to Data 8
Data 7 to Data 0
Data 31 to Data 24
Data 23 to Data 16
Data 15 to Data 8
Data 7 to Data 0
WRH
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Strobe Signals
WRL
Assert
Assert
Assert
Assert
Assert
Assert
Assert
Assert
Assert
Assert
Assert
Assert