Section 27 NAND Flash Memory Controller (FLCTL)
Rev.1.00 Dec. 13, 2005 Page 1044 of 1286
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27.4 Operation
27.4.1 Operating
Modes
Two operating modes are supported.
•
Command access mode
•
Sector access mode
27.4.2 Command
Access
Mode
Command access mode accesses flash memory by specifying a command to be issued to flash
memory, address, data, read or write direction, and number of times to the registers. In this mode,
I/O data can be transferred by the DMA via FLDTFIFO.
NAND-Type Flash Memory Access: Figure 27.2 shows an example of read operation for
NAND-type flash memory. In this example, the first command is specified as H'00, address data
length is specified as 3 bytes, and the number of read bytes is specified as 8 bytes in the data
counter.
CLE
Command stage
Address stage
Data stage
ALE
WE
RE
I/O7 to I/O0
R/
B
H'00
A2
A1
A3
1
2
3
4
5
8
Figure 27.2 Read Operation Timing for NAND-Type Flash Memory (1)
Содержание SH7780 Series
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