Section 11 Local Bus State Controller (LBSC)
Rev. 1.00 Oct. 01, 2007 Page 399 of 1956
REJ09B0256-0100
11.5.7 Byte
Control SRAM Interface
The byte control SRAM interface is a memory interface that outputs a byte-select strobe (
WEn
) in
both read and write bus cycles. This interface has 16-bit data pins and can be connected to SRAM
having an upper byte select strobe and lower select strobe functions, such as UB and LB.
Areas 1 and 4 can be specified as a byte control SRAM interface. However, when these areas are
set to the MPX interface, the MPX interface has priority.
The write timing for the byte control SRAM interface is identical to that of a normal SRAM
interface.
In read operations, on the other hand, the
WEn
pin timing is different. In a read access, only the
WE
signal for the byte being read is asserted. Assertion is synchronized with the falling edge of
the CLKOUT clock in the same way as for the
WE
signal, while negation is synchronized with the
rising edge of the CLKOUT clock in the same way as for the
RD
signal.
In 32-byte transfer, a total of 32 bytes are transferred continuously according to the set bus width.
The first access is performed on the data for which there was an access request, and the remaining
accesses are performed in wrap around method according to the set bus width. The bus is not
released during this transfer.
Figure 11.37 shows an example of a byte control SRAM connection, and figures 11.38 to 11.40
show examples of byte-control SRAM read cycles.
A18 to A3
CSn
RD
RDWR
This LSI
64K × 16-bit
SRAM
D15 to D0
WE1
WE0
A15 to A0
CS
OE
WE
I/O15 to I/O0
UB
LB
A15 to A0
CS
OE
WE
I/O15 to I/O0
UB
LB
D31 to D16
WE3
WE2
Figure 11.34 Example of 32-Bit Data-Width Byte-Control SRAM
Summary of Contents for SH7763
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Page 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Page 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Page 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Page 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Page 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Page 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Page 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Page 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Page 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Page 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Page 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Page 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Page 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Page 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Page 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Page 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Page 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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