Section 27 NAND Flash Memory Controller (FLCTL)
Rev.1.00 Dec. 13, 2005 Page 1052 of 1286
REJ09B0158-0100
Command access (Flash Read)
Yes
No
Set common control register (FLCMNCR)
ACM [1:0] = 00 (command access mode)
CE0 = 1 (chip enable)
TYPESEL = 1 (select NAND type flash memory)
Set command control register (FLCMDCR)
DOCMD1 = 1 (perform first command stage)
DOADR = 1 (perform address stage)
ADRMD = 1 (address register value is output as
memory address)
ADRCNT [1:0] = 10 (issue 3-byte address)
DOSR = 1 (perform status read)
Set command code register (FLCMCDR)
CMD [7:0] = H'00 (flash read)
Address register (FLADR)
Set address to ADR [7:0], ADR [15:8], ADR [23:16]
Data counter register (FLDTCNTR)
Specify number of bytes of read data to DTCNT [11:0]
Interrupt DMA control register (FLINTDMACR)
Set enable bit of DMA transfer or interrupt request
in use
Set transfer control register (FLTRCR)
TRSTRT=1 (Start flash memory accessing)
Perform flash memory reading
Issue first command
Issue address
Issue second command
Read status
FLTRCR.TREND = 1?
End of flash memory access
FLTRCR.TREND = 0 (clear Processing End Flag)
Read status
Check status (FLBSYCNT.STAT [7:0])
END
Figure 27.10 NAND Flash Command Access (Flash Read)
Содержание SH7780 Series
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