Section 6 Bus Controller (BSC)
Rev.2.00 Jun. 28, 2007 Page 186 of 666
REJ09B0311-0200
6.8.2 Data
Bus
The bus width of the burst ROM space can be specified as 8-bit or16-bit burst ROM interface
space according to the ABWHn and ABWLn bits (n = 0, 1) in ABWCR.
For the 8-bit bus width, data bus (D7 to D0) is valid. For the 16-bit bus width, data bus (D15 to
D0) is valid.
Access size and data alignment are the same as the basic bus interface. For details, see section
6.5.6, Endian and Data Alignment.
6.8.3
I/O Pins Used for Burst ROM Interface
Table 6.17 shows the pins used for the burst ROM interface.
Table 6.17 I/O Pins Used for Burst ROM Interface
Name
Symbol
I/O
Function
Bus cycle start
BS
Output
Signal indicating that the bus cycle has started.
Address strobe
AS
Output
Strobe signal indicating that an address output on the
address bus is valid during access
Read strobe
RD
Output
Strobe signal indicating the read access
Read/write RD/
WR
Output
Signal indicating the data bus input or output direction
Low-high write
LHWR
Output
Strobe signal indicating that the upper byte (D15 to
D8) is valid during write access
Low-low write
LLWR
Output
Strobe signal indicating that the lower byte (D7 to D0)
is valid during write access
Chip select 0. 1
CS0
,
CS1
Output
Strobe signal indicating that the area is selected
Wait
WAIT
Input
Wait request signal used when an external address
space is accessed
Содержание H8SX/1650
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