Section 11 Local Bus State Controller (LBSC)
Rev.1.00 Dec. 13, 2005 Page 357 of 1286
REJ09B0158-0100
11.5.2 Areas
(1) Area
0
For area 0, physical address bits 28 to 26 are 000.
The interfaces that can be set for this area are the SRAM, burst ROM and MPX interfaces.
A bus width of 8, 16, or 32 bits is selectable with external pins MODE4 and MODE3 at a power-
on reset. For details, see section 11.3.2, Memory Bus Width.
When area 0 is accessed, the
CS0
signal is asserted.
In the case where the SRAM interface is set, the
RD
signal, which can be used as OE, and write
control signals WE0 to WE3 are asserted.
For the number of bus cycles, 0 to 25 wait cycles inserted by CS0WCR can be selected.
When the burst ROM interface is used, a burst pitch number in the range of 0 to 7 is selectable
with bits BW2 to BW0 in CS0BCR.
Any number of wait cycles can be inserted in each bus cycle through the external wait pin (
RDY
).
(When the insert number is 0, the
RDY
signal is ignored.)
When the burst ROM interface is used, the number of transfer cycles for a burst cycle is selected
from a range of 2 to 9 according to the number of wait cycles.
The setup time and hold time (cycle number) of the address and
CS0
signals to the read and write
strobe signals can be set within a range of 0 to 7 cycles by CS0WCR. The
BS
hold cycles can be
set within a range of 0 to 1 when the number for the read and write strobe setup wait is 1 or more.
(2) Area
1
For area 1, physical address bits 28 to 26 are 001.
The interfaces that can be set for this area are the SRAM, burst ROM, MPX and byte-control
SRAM interfaces.
A bus width of 8, 16, or 32 bits is selectable with bits SZ in CS1BCR. When the MPX interface is
used, a bus width of 32 bits should be selected through bits SZ in CS1BCR. When using the byte-
control SRAM interface, select a bus width of 16 or 32 bits.
When area 1 is accessed, the
CS1
signal is asserted.
Содержание SH7780 Series
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Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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