USB2250 SMSC Corporation, USB2250 Datasheet - Page 16

• Manufacturer Part Number: USB2250
• Description: Ultra Fast USB 2.0 Multi-Format Flash Media Controller
• Manufacturer: SMSC Corporation

Revision 2.6 (05-08-08)
SM Address
Strobe
SM Command
Strobe
SM Data 7-0
SM Read
Enable
SM Write
Enable
SM Write
Protect Switch
SM Busy or
Data Ready
NAME
Table 5.1 USB2250/51/59 128-Pin VTQFP Pin Descriptions (continued)
SM_nWPS
SM_D[7:0]
SYMBOL
SM_nWE
SM_CLE
SM_nRE
SM_nBR
SM_ALE
128-PIN
VTQFP
52
53
39
40
41
42
43
44
45
46
55
48
38
56
DATASHEET
BUFFER
I/O12PD
O12PD
O12PD
O12PU
O12PU
TYPE
IPU
IPU
16
DESCRIPTION
This pin is an active high Address Latch Enable
signal for the SM device.
This pin has a weak pull-down resistor that is
permanently enabled.
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.
These pins are the bi-directional data signals
SM_D7-SM_D0.
The bi-directional data signal has an internal weak
pull-down resistor.
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, and is controlled
by the SM_PU bit of the SMC_CTL register.
If an external FET is used (Internal FET is
disabled), then the internal pull-up is not available
(external pull-ups must be used).
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, and is controlled
by the SM_PU bit of the SMC_CTL register.
If an external FET is used (Internal FET is
disabled), then the internal pull-up is not available
(external pull-ups must be used).
A write-protect seal is detected when this pin is
low.
This pin has an internal weak pull-up resistor that
is controlled by the SM_INTF_EN bit of the
SMC_MODE_CTL2 register.
This pin is connected to the BSY/RDY pin of the
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, and is controlled
by the SM_PU bit of the SMC_CTL register.
If an external FET is used (Internal FET is
disabled), then the internal pull-up is not available
(external pull-ups must be used).
Ultra Fast USB 2.0 Multi-Format Flash Media Controller
SMSC USB2250/51/59
Datasheet