Section 6 Bus Controller (BSC)
Rev.2.00 Jun. 28, 2007 Page 190 of 666
REJ09B0311-0200
6.9.2 Address/Data
Multiplex
In the address/data multiplexed I/O space, data bus is multiplexed with address bus. Table 6.18
shows the relationship between the bus width and address output.
Table 6.18 Address/Data Multiplex
Bus Width
Cycle
Data Pins
Address
Data
Address
Data
8 bits
16 bits
PI7
A15
D15
PI6
A14
D14
PI5
A13
D13
PI4
A12
D12
PI3
A11
D11
PI2
A10
D10
PI1
A9
D9
PI0
A8
D8
PH7
A7
D7
A7
D7
PH6
A6
D6
A6
D6
PH5
A5
D5
A5
D5
PH4
A4
D4
A4
D4
PH3
A3
D3
A3
D3
PH2
A2
D2
A2
D2
PH1
A1
D1
A1
D1
PH0
A0
D0
A0
D0
6.9.3 Data
Bus
The bus width of the address/data multiplexed I/O space can be specified for either 8-bit access
space or 16-bit access space by the ABWHn and ABWLn bits (n = 3 to 7) in ABWCR.
For the 8-bit access space, D7 to D0 are valid for both address and data. For 16-bit access space,
D15 to D0 are valid for both address and data. If the address/data multiplexed I/O space is
accessed, the corresponding address will be output to the address bus.
For details on access size and data alignment, see section 6.5.6, Endian and Data Alignment.
Содержание H8SX/1650
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