r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 348
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r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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Section 8 Bus State Controller (BSC)
8.5.7
The burst ROM (clocked asynchronous) interface is used to access a memory with a high-speed
read function using a method of address switching called the burst mode or page mode. In a burst
ROM (clocked asynchronous) interface, basically the same access as the normal space is
performed, but the 2nd and subsequent access cycles are performed only by changing the address,
without negating the RD signal at the end of the 1st cycle. In the 2nd and subsequent access
cycles, addresses are changed at the falling edge of the CKIO.
For the 1st access cycle, the number of wait cycles specified by the W3 to W0 bits in CSnWCR is
inserted. For the 2nd and subsequent access cycles, the number of wait cycles specified by the W1
to W0 bits in CSnWCR is inserted.
In the access to the burst ROM (clocked asynchronous), the BS signal is asserted only to the first
access cycle. An external wait input is valid only to the first access cycle.
In the single access or write access that does not perform the burst operation in the burst ROM
(clocked asynchronous) interface, access timing is same as a normal space. In addition, there are
some restrictions on 16-byte write access. For details, see section 8.6, Usage Notes.
Table 8.17 lists a relationship between bus width, access size, and the number of bursts. Figure
8.36 shows a timing chart.
Table 8.17 Relationship between Bus Width, Access Size, and Number of Bursts
Rev. 2.00 Dec. 09, 2005 Page 324 of 1152
REJ09B0191-0200
Bus Width
8 bits
16 bits
Burst ROM (Clocked Asynchronous) Interface
Access Size
8 bits
16 bits
32 bits
16 bytes
8 bits
16 bits
32 bits
16 bytes
CSnWCR. BST[1:0] Bits Number of Bursts Access Count
Not affected
Not affected
Not affected
00
01
Not affected
Not affected
Not affected
00
01
10*
1
2
4
16
4
1
1
2
8
2
4
2, 4, 2
1
1
1
1
4
1
1
1
1
4
2
3
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