r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 385
r5s77631ay266bgv
Manufacturer Part Number
r5s77631ay266bgv
Description
Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S77631AY266BGV.pdf
(2026 pages)
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The local bus state controller (LBSC) divides the external memory space and outputs control
signals corresponding to the specifications of various types of memory and bus interfaces. The
LBSC enables the connection of SRAM or ROM, etc., to this LSI. It also supports the PCMCIA
interface protocol, which is used to implement simplified system design and high-speed data
transfers in a compact system.
11.1
The LBSC has the following features.
• Controls six areas, areas 0 to 2 and 4 to 6, of an external memory space divided into seven
• SRAM interface
• Burst ROM interface
areas.
Maximum 64 Mbytes for each of areas 0 to 2 and 4 to 6
Bus width of each area can be controlled through register settings (except area 0, which is
Wait-cycle insertion by the RDY pin
Wait-cycle insertion can be controlled by a program
Types of memory are specifiable for connection to each area
Output of the control signals of memory to each area
Automatic wait cycle insertion to prevent data bus collisions on consecutive memory
Insertion of cycles to ensure the setup time and hold time to the write strobe on a write
Wait-cycle insertion can be controlled by a program
Insertion of the wait cycle through the RDY pin
Wait-cycle insertion can be controlled by a program
Burst length specified by the register
controlled by the external pin setting)
accesses to different areas, or a read access followed by a write access to the same area
cycle enables connection to low-speed memory
Connectable areas : 0 to 2 and 4 to 6
Settable bus widths: 32, 16, and 8 bits
Connectable areas: 0 to 2 and 4 to 6
Settable bus widths: 32, 16, and 8 bits
Features
Section 11 Local Bus State Controller (LBSC)
Section 11 Local Bus State Controller (LBSC)
Rev. 1.00 Oct. 01, 2007 Page 319 of 1956
REJ09B0256-0100
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