SMSC USB2250, USB2250i, USB2251, USB2251i manual 13

Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Datasheet

Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)

		128-PIN	BUFFER
NAME	SYMBOL	VTQFP	TYPE	DESCRIPTION
SM Address	SM_ALE	52	O12PD	This pin is an active high Address Latch
Strobe				Enable signal for the SM device.
				This pin has a weak pull-down resistor that
				is permanently enabled.
SM Command	SM_CLE	53	O12PD	This pin is an active high Command Latch
Strobe				Enable signal for the SM device.
				This pin has a weak pull-down resistor that
				is permanently enabled.
SM Data 7-0	SM_D[7:0]	39	I/O12PD	These pins are the bi-directional data signals
		40		SM_D7-SM_D0.
		41		The bi-directional data signal has an internal
		42
				weak pull-down resistor.
		43
		44
		45
		46
SM Read Enable	SM_nRE	55	O12PU	This pin is an active low read strobe signal
				for 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).
SM Write Enable	SM_nWE	48	O12PU	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).
SM Write Protect	SM_nWPS	38	IPU	A write-protect seal is detected when this pin
Switch				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.

SMSC USB2250/50i/51/51i 13 Revision 1.1 (05-29-08)

DATASHEET