Section 11 Local Bus State Controller (LBSC)
Rev.1.00 Dec. 13, 2005 Page 361 of 1286
REJ09B0158-0100
When area 6 is accessed, the
CS6
signal is asserted.
In addition, the
RD
signal, which can be used as
OE
, and write control signals
WE0
to
WE3
are
asserted. While the PCMCIA interface is used, the
CE1B
and
CE2B
signals, the
RD
signal (which
can be used as
OE
), and the
WE0
,
WE1
,
WE2
, and
WE3
signals (which can be used as
REG
,
WE
,
IORD
, and
IOWR
, respectively) are asserted.
For the number of bus cycles, 0 to 25 wait cycles inserted by CS6WCR can be selected.
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.)
The setup time and hold time (cycle number) of the address and
CS6
signals to the read and write
strobe signals can be set within a range of 0 to 7 cycles by CS6WCR. 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.
For the PCMCIA interface, the setup time of addresses to the read/write strobe signals (
CE1B
and
CE2B
) can be specified within a range from 0 to 15 cycles by bits TEDA/B2 to TEDA/B0 and
TEHA/B2 to TEHA/B0 in CS6PCR. In addition, the number of wait cycles can be specified within
a range from 0 to 50 cycles by bits PCWA/B1 and PCWA/B0. The number of wait cycles
specified by CS6PCR is added to the value specified by IW3 to IW0 in CS6WCR or PCIW3 to
PCIW0 in CS6PCR.
11.5.3 SRAM
interface
(1) Basic
Timing
The strobe signals for the SRAM interface of this LSI are output primarily based on the SRAM
connection. Figure 11.4 shows the basic timing of the SRAM interface. A no-wait normal access
is completed in two cycles. The
BS
signal is asserted for one cycle to indicate the start of a bus
cycle. The
CSn
signal is asserted at the rising edge of the clock in the T1 state, and negated at the
next rising edge of the clock in the T2 state. Therefore, there is no negation period in the case of
access at minimum pitch.
During reading, specification of an access size is not needed. The output of an access address on
the address pins (A25 to A0) is correct, however, since the access size is not specified, 32-bit data
is always output when a 32-bit device is in use, and 16-bit data is output when a 16-bit device is in
use. During writing, only the
WE
signal corresponding to the byte to be written is asserted. For
details, see section 11.5.1, Endian/Access Size and Data Alignment.
In 32-byte transfer, a total of 32 bytes are transferred continuously according to the bus width set.
The first access is performed on the data for which there was an access request, and the remaining
Содержание SH7780 Series
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Страница 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Страница 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
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 ...
Страница 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Страница 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Страница 1004: ...Section 24 Multimedia Card Interface MMCIF Rev 1 00 Dec 13 2005 Page 954 of 1286 REJ09B0158 0100 ...
Страница 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
Страница 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Страница 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Страница 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Страница 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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