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176

AT85C51SND3Bx

7632A–MP3–03/06

Figure 80. Nand Flash Read Example

Legend:

•“ifc CPU” illustrates the commands given by the CPU to the NFC.

• “auto” illustrates the actions automatically launched by the NFC.

• “ready” is the flow control line between the DFC macro and the NFC interface.

• “BUSYD” is the busy state of the device D.

• “P” is the Polling action.

Data Unit The Data Unit works closely to the DFC and is responsible of all the data transfer

between the NF memories and on-chip memories (USB, SRAM, …).

Data and Spare Zone For management convenience, the controller is mapping a memory page as some data

and spare zones.

A ‘data zone’ is a data area composed of NDB contiguous bytes.

The ‘spare zone’ is located after the ‘data zone’ until the end of the page.

NDB is part of the configuration descriptor (see Table 189) and its use is described in

the following examples:

• SMC page, “512B” NF page, “512B” XD card

A page is composed of 512 contiguous data bytes (NDB= 1), followed by a spare

zone of 16 bytes.

•“2kB” NF page

A page is composed of 1024 contiguous data bytes (NDB= 4), followed by a spare

zone of 64 bytes

Spare Zone Content The “16-byte” spare zone contains information as specified in Table 195.

ifc CPU

Ready

BUSY

Dev

ADC

ADR

auto

NFD

ATF

NFD

ATF

NFD

ATF

NFD

ATF

NFD

ATF

NFD

ATF

NFD

ATF

CMD

00h

CMD

00h

manual

return in

read mode

Data zone Spare zone

(Check ECC; etc...)

Check

End of

page

Must be held low during Tr

ACT

(R)

NFD

ATF

CMD

70h

CMD

70h

NFD

ATF

dum

ACTACT

Data zone

Spare

zone

512 B 16 B

Data zone

2048 B 64 B

Spare

zone

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 262 263

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