at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 169

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

Nand Flash
Controller
Functional overview
7632C–MP3–11/06
The AT85C51SND3B derivatives implement a hardware Nand Flash Controller (NFC)
embedding the following features:
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As shown in Figure 78 the NFC architecture is based on six hardware units:
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These units are detailed in the following sections.
Figure 78. NFC Controller Block Diagram
CLOCK
CPU
DFC
Up to 4 Nand Flash (NF) memories
SMC/XD support with up to 3 NF memories
512-byte, 1024-byte, 2048-byte page size support (provision for up to 8192-byte
page size)
Hardware ECC support
High speed: up to 35 ns cycle time NF support
Two separated secured memory segments:
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Hardware write protection management for application code segment
Very high data transfer rate in read and write using DFC interface
Proprietary wear-levelling support with extremely reduced CPU load
The Clock unit
The Control unit
The Data unit
The Security unit
The Card Unit
The Interrupt unit
NFC
Bus
Bus
application segment for user codes, audio codec codes, fonts, screens…
mass storage segment for FAT formatting
NFCON.0
NFEN
Security
Control
Data
Card
Unit
Unit
Unit
Unit
AT85C51SND3B
Interrupt
Unit
NFCE3:0
NFCLE
NFALE
NFWE
NFRE
NFC
Interrupt
Request
NFD7:0
NFWP
SMINS
SMLCK
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