Section 11 Local Bus State Controller (LBSC)
Rev. 1.00 Oct. 01, 2007 Page 373 of 1956
REJ09B0256-0100
11.5.4 Burst
ROM
Interface
Setting the TYPE bit in CSnBCR(n=0 to 2 and 4 to 6) to 010 allows a burst ROM to be connected
to areas 0 to 2 and 4 to 6. The burst ROM interface provides high-speed access to ROM that has a
burst access function. The burst access timing of burst ROM is shown in figure 11.11. The wait
cycle is set to 0 cycle. Although the access is similar to that of the SRAM interface, only the
address is changed when the first cycle ends and then the next access is started. When 8-bit ROM
is used, the number of consecutive accesses can be set as 4, 8, 16, or 32 through bits BST[2:0] in
CSnBCR(n=0 to 2 and 4 to 6). Similarly, when 16-bit ROM is used, 4, 8 or 16 accesses can be set;
when 32-bit ROM is used, 4 or 8 accesses can be set.
The
RDY
signal is always sampled when one or more wait cycles are set. Even when no wait is
specified in the burst ROM settings, two access cycles are inserted in the second and subsequent
accesses as shown in figure 11.12.
A writing operation for the burst ROM interface is performed in the same way as for the SRAM
interface.
In a 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 11.13 shows the timing chart when the burst ROM is used and setup/hold is specified by
CSnWCR.
Summary of Contents for SH7763
Page 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
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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