at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 11

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

USB Controller
7632C–MP3–11/06
Table 7. USB Controller Signal Description
UVCON
SMLCK
NFCLE
NFCE0
NFCE1
NFCE2
NFCE3
SMINS
Signal
NFWE
NFWP
Signal
SMCE
Name
NFRE
Name
DMF
DMH
DPF
DPH
Type Description
Type Description
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
I
I
Command Latch Enable Signal
Asserted high during command write cycle.
Read Enable Signal
Read signal asserted low during NF/SMC read operation.
Write Enable Signal
Write signal asserted low during NF/SMC write operation.
Nand Flash 0 Chip Enable
NFCE0 is active low and is asserted by the nand flash controller each
time it makes access to the device 0.
Nand Flash 1 Chip Enable
NFCE1 is active low and is asserted by the nand flash controller each
time it makes access to the selected device.
SmartMediaCard/xD-Picture Card Write Lock Signal
SMLCK is the card write protected input. A low level on this pin
indicates the card is write protected.
Note:
Nand Flash 2 Chip Enable
NFCE2 is active low and is asserted by the nand flash controller each
time it makes access to the selected device.
SmartMediaCard/xD-Picture Card Insertion Signal
SMINS is the card presence signal. A low level on this input indicates
the card is present in its slot.
Note:
Nand Flash 3 Chip Enable
NFCE3 is active low and is asserted by the nand flash controller each
time it makes access to the selected device.
SmartMediaCard/xD-Picture Card Chip Enable
SMCE is active low and is asserted by the nand flash controller each
time it makes access to the card.
Write Protect Signal
NFWP is the Nand Flash / SmartMediaCard/xD-Picture Card write
protect signal. This signal is active low and is set to low during reset in
order to protect the memory against parasitic writes.
USB Full Speed Positive Data Upstream Port
USB Full Speed Minus Data Upstream Port
USB High Speed Plus Data Upstream Port
USB High Speed Minus Data Upstream Port
USB VBUS Control line
UVCON is used to control the external VBUS power supply ON or OFF.
Note:
When used as SMLCK input, pad has internal pull-up.
When used as SMINS input, pad has internal pull-up.
This output is requested for OTG mode.
AT85C51SND3B
Alternate
Function
Alternate
Function
P4.4
P4.5
P4.6
P3.6
-
-
-
-
-
-
-
-
-
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