HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 255

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

9.1
The bus state controller (BSC) outputs control signals for various types of memory that is
connected to the external address space and external devices. BSC functions enable this LSI to
connect directly with SRAM, SDRAM, and other memory storage devices, and external devices.
9.1.1
The BSC has the following features:
1. Physical address space is divided into eight areas
A maximum 16 Mbytes for each of the three areas, CS0, CS3, and CS4, totally 48 Mbytes.
Can specify the normal space interface, SRAM interface with byte selection, burst ROM interface,
Can select the data bus width (8 or 16 bits) for each address space*
Controls the insertion of the wait state for each address space.
Controls the insertion of the wait state for each read access and write access.
Can set the independent idling cycle in the continuous access for five cases: read-write (in same
2. Normal space interface
Supports the interface that can directly connect to the normal memories such as SRAM and ROM.
3. Burst ROM interface
High-speed access to the ROM that has the page mode function (page flash ROM).
4. SDRAM interface
Can set the SDRAM in CS3 area.
Multiplex output for row address/column address.
Efficient access by single read/single write.
High-speed access by the bank-active mode.
Supports an auto-refresh and self-refresh.
and SDRAM interface*
space/different space), read-read (in same space/different space), the first cycle is a write
access.
Overview
Features
Section 9 Bus State Controller (BSC)
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Rev. 1.00, 02/04, page 217 of 804
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