HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 204

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

9. Bus State Controller (BSC)
9.7.2
For consecutive accesses to the same CS space, waits are inserted to provide the number of idle
cycles designated by bits CW3 to CW0 in BCR2. However, in the case of a write cycle after a
read, the number of idle cycles inserted will be the larger of the two values designated by the IW
and CW bits. When idle cycles already exist between access cycles, waits are not inserted.
Figure 9.8 shows an example. A continuous access idle is specified for CSn space, and CSn space
is consecutively write-accessed.
Rev.4.00 Mar. 27, 2008 Page 160 of 882
REJ09B0108-0400
Figure 9.8 Example of Idle Cycle Insertion at Same Space Consecutive Access
Simplification of Bus Cycle Start Detection
Address
WRxx
Data
CSn
CK
RD
CSn space access
T1
T2
Idle cycle
Tidle
CSn space access
T1
T2