HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 205
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HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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The bus state controller (BSC) divides physical address space and output control signals for
various types of memory and bus interface specifications. BSC functions enable this LSI to link
directly with DRAM, synchronous DRAM, SRAM, ROM, and other memory storage devices
without an external circuit. The BSC also allows direct connection to PCMCIA interfaces,
simplifying system design and allowing high-speed data transfers in a compact system.
Figure 8.1 shows the block diagram of the BSC.
8.1
The BSC has the following features:
Physical address space is divided into six areas
Direct interface to synchronous DRAM (except when clock ratio becomes I :B = 1:1)
Burst ROM interface
PCMCIA direct-connection interface
A maximum 64 Mbytes for each of the six areas, 0, 2 to 6
Area bus width can be selected by register (area 0 is set by external pin)
Wait states can be inserted using the WAIT pin
Wait state insertion can be controlled through software. Register settings can be used to
specify the insertion of 1 to 10 cycles independently for each area (1 to 38 cycles for areas
5 and 6 and the PCMCIAT interface only)
The type of memory connected can be specified for each area, and control signals are
output for direct memory connection
Wait cycles are automatically inserted to avoid data bus conflict for continuous memory
accesses to different areas or writes directly following reads of the same area
Multiplexes row/column addresses according to synchronous DRAM capacity
Supports burst operation
Supports bank active mode
Has both auto-refresh and self-refresh functions
Controls timing of synchronous DRAM direct-connection control signals according to
register setting
Insertion of wait states controllable through software
Register setting control of burst transfers
Insertion of wait states controllable through software
Bus sizing function for I/O bus width (only in the little endian mode)
Feature
Section 8 Bus State Controller (BSC)
Rev. 4.00, 03/04, page 159 of 660
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