at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 177

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Data Unit
Data and Spare Zone
Spare Zone Content
7632C–MP3–11/06
ifc CPU
BUSY
Ready
auto
CE
RE
D
D
ACT
Dev
CMD
70h
NFD
dum
ATF
my
NFD
ATF
OK
CMD
00h
Figure 80. Nand Flash Read Example
Legend:
•
•
•
•
•
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, …).
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 190) and its use is described in
the following examples:
•
•
The “16-byte” spare zone contains information as specified in Table 196.
ADC
C
“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.
“BUSY
“P” is the Polling action.
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.
ADR
R1
ADR
R2
ACT
CE
D
=0
” is the busy state of the device D.
D
ADR
R3
CMD
70h
Must be held low during Tr
NFD
dum
ATF
my
NFD
ATF
NFD
ATF
Tr
NFD
ATF
NFD
ATF
NFD
ATF
Data zone
Data zone
2048 B
NFD
512 B
ATF
OK
manual
return in
read mode
CMD
00h
CE
=1
Spare
zone
D
16 B
ACT
(R)
AT85C51SND3B
Data zone
Spare
zone
64 B
(Check ECC; etc...)
Spare zone
Check
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