r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 320
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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)
(3)
A burst read occurs in the following cases with this LSI.
• Access size in reading is larger than data bus width.
• 16-byte transfer in cache miss.
• 16-byte transfer in DMAC
This LSI always accesses the SDRAM with burst length 1. For example, read access of burst
length 1 is performed consecutively 4 times to read 16-byte continuous data from the SDRAM that
is connected to a 32-bit data bus. This access is called the burst read with the burst number 4.
Table 8.14 shows the relationship between the access size and the number of bursts.
Table 8.14 Relationship between Access Size and Number of Bursts
Figures 8.18 and 8.19 show a timing chart in burst read. In burst read, an ACTV command is
output in the Tr cycle, the READ command is issued in the Tc1, Tc2, and Tc3 cycles, the READA
command is issued in the Tc4 cycle, and the read data is received at the rising edge of the external
clock (CKIO) in the Td1 to Td4 cycles. The Tap cycle is used to wait for the completion of an
auto-precharge induced by the READA command in the SDRAM. In the Tap cycle, a new
command will not be issued to the same bank. However, access to another CS space or another
bank in the same SDRAM space is enabled. The number of Tap cycles is specified by the WTRP1
and WTRP0 bits in CS3WCR.
Rev. 2.00 Dec. 09, 2005 Page 296 of 1152
REJ09B0191-0200
Bus Width
16 bits
32 bits
Burst Read
Access Size
8 bits
16 bits
32 bits
16 bits
8 bits
16 bits
32 bits
16 bits
Number of Bursts
1
1
2
8
1
1
1
4
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