Section 11 Local Bus State Controller (LBSC)
Rev.1.00 Dec. 13, 2005 Page 315 of 1286
REJ09B0158-0100
Section 11 Local Bus State Controller (LBSC)
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 Features
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
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
controlled by the external pin setting)
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
accesses
Insertion of cycles to ensure the setup time and hold time to the write strobe on a write
cycle enables connection to low-speed memory
•
SRAM interface
Wait-cycle insertion can be controlled by a program
Insertion of the wait cycle through the
RDY
pin
Connectable areas : 0 to 2 and 4 to 6
Settable bus widths: 32, 16, and 8 bits
•
Burst ROM interface
Wait-cycle insertion can be controlled by a program
Burst length specified by the register
Connectable areas: 0 to 2 and 4 to 6
Settable bus widths: 32, 16, and 8 bits
Содержание SH7780 Series
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