USB2228 SMSC Corporation, USB2228 Datasheet - Page 13

• Manufacturer Part Number: USB2228
• Description: (USB2227 / USB2228) 4th Generation USB2.0 Flash Media Controller
• Manufacturer: SMSC Corporation

4th Generation USB2.0 Flash Media Controller with Integrated Card Power FETs
Datasheet
SMSC USB2227/USB2228
SM_nWPS
SM_D[7:0]
SYMBOL
SM_nB/R
SM_nWE
SM_CLE
SM_nRE
128-PIN
VTQFP
75
72
71
70
69
68
67
66
65
81
82
76
77
124-PIN
DQFN
A38
B34
A36
A35
B33
A34
B32
A33
B31
A41
B39
B36
A39
BUFFER
I/O8PD
O8PD
O8PU
TYPE
08PU
IPU
08
08
DATASHEET
I
13
SM Command Strobe:
This pin is an active high Command Latch Enable signal
for the SM device.
This pin has a weak pull-down resistor that is
permanently enabled.
SM Data 7-0:
These pins are the bi-directional data signal SM_D7-
SM_D0.
The bi-directional data signal has an internal weak pull-
down resistor.
SM Read Enable:
This pin is an active low read strobe signal for SM
device.
When using the internal FET, this pin has an internal
weak pull-up resistor that is tied to the output of the
internal Power FET.
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external pull-
ups must be used, and should be connected to the
applicable Card Power Supply).
SM Write Enable:
This pin is an active low write strobe signal for SM
device.
When using the internal FET, this pin has an internal
weak pull-up resistor that is tied to the output of the
internal Power FET.
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external pull-
ups must be used, and should be connected to the
applicable Card Power Supply).
SM Write Protect Switch:
A write-protect seal is detected, when this pin is low.
This pin has an internally controlled weak pull-up
resistor.
SM Busy or Data Ready:
This pin is connected to the BSY/RDY pin of the SM
device.
An external pull-up resistor is required on this signal.
The pull-up resistor must be pulled up to the same
power source that powers the SM/NAND flash device.
DESCRIPTION
Revision 1.91 (10-13-06)