Renesas SH7781 - Manual (Page 1394)

27. NAND Flash Memory Controller (FLCTL)
Rev.1.00 Jan. 10, 2008 Page 1364 of 1658
REJ09B0261-0100
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 is a mode that accesses flash memory by specifying a command to be
issued to flash memory, address, data, read or write direction, and number of times for the
registers. In this mode, DMA transfer of input or output data can be performed by using
FLDTFIFO.
(1)
NAND-Type Flash Memory Access (512 + 16 Bytes)
Figure 27.2 shows an example of reading operation for NAND-type flash memory. In this
example, the first command is set to H'00, address data length is set to 3 bytes, and the number of
read bytes is set to 6 bytes in the data counter.
CLE
ALE
I/O7 to I/O0
R/B
H'00 A2 A1 A3 1 2 3 4
WE
RE
5 6
Command stage Address stage Data stage
Figure 27.2 Reading Operation Timing for NAND-Type Flash Memory