SH7144_08 Datasheet, PDF (194/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

9. Bus State Controller (BSC)
Bit Bit Name Initial Value R/W Description
5
CW1
1
R/W Idle cycles at continuous access to CS1 and CS5 spaces
This bit inserts an idle cycle and negates the CS1 signal to
make the bus cycle end obvious when accessing the CS1
space continuously. An idle cycle set by this bit is also
inserted when access is made to the CS5 space after
access to the CS1 space. In addition, an idle cycle set by
this bit is inserted when continuous access is made to the
CS5 space, and when access is made to the CS1 space
after access to the CS5 space.
0: No idle cycle inserted at continuous access to the CS1
and CS5 spaces.
1: One idle cycle inserted at continuous access to the CS1
and CS5 spaces.
When the write cycle follows the read cycle, the larger of
the value specified with IW and that specified with CW is
used as the idle cycles to be inserted.
4
CW0
1
R/W Idle cycles at continuous access to CS0 and CS4 spaces
This bit inserts an idle cycle and negates the CS0 signal to
make the bus cycle end obvious when accessing the CS0
space continuously. An idle cycle set by this bit is also
inserted when access is made to the CS4 space after
access to the CS0 space. In addition, an idle cycle set by
this bit is inserted when continuous access is made to the
CS4 space, and when access is made to the CS0 space
after access to the CS4 space.
0: No idle cycle inserted at continuous access to the CS0
and CS4 spaces.
1: One idle cycle inserted at continuous access to the CS0
and CS4 spaces.
3
SW3
1
When the write cycle follows the read cycle, the larger of
the value specified with IW and that specified with CW is
used as the idle cycles to be inserted.
R/W CS assert period extension for CS3 and CS7 spaces
This bit inserts a cycle to prevent the assert period of RD
and WRx from extending the assert period of CS3 and
CS7.
0: No cycle inserted for CS assert period for CS3 and CS7
spaces.
1: CS assert extension for CS3 and CS7 spaces.
(Each one cycle inserted before and after the bus cycle)
Rev.4.00 Mar. 27, 2008 Page 150 of 882
REJ09B0108-0400