Lucent Technologies Pin Information continued, USS-720 Instant USB, USB-to-IEEE 1284 Bridge

USS-720Instant USB	Preliminary Data Sheet, Rev. 5
USB-to-IEEE1284 Bridge	September 1999

Pin Information (continued)

Table 1. Pin Descriptions (continued)

Pin	Symbol*	Type	Name/Description
9	VDD5	P	5 V Power Supply for 5 V Parallel Port Signals.
10	PDATA[7]	I/O	Parallel Port Data Signal Bit 7.
11	NAUTOFD	O	Parallel Port nAutoFd Signal (Active-Low).
12	NSELECTIN	O	Parallel Port nSelectIn Signal (Active-Low).
13	NINIT	O	Parallel Port nInit Signal (Active-Low).
14	NACK	I	Parallel Port nAck Signal (Active-Low).
15	BUSY	I	Parallel Port Busy Signal.
16	VDD	P	3.3 V Power Supply.
17	GND	P	Ground.
18	PERROR	I	Parallel Port PError Signal.
19	SELECT	I	Parallel Port Select Signal.
20	NFAULT	I	Parallel Port nFault Signal (Active-Low).
21	CLK_LO	I	Clock Low. Crystal or CMOS input.
22	CLK_HI	O	Clock High. Crystal or no connection.
23	SCAN	I	Scan. This signal is only used for production testing. Tie to GND for normal opera-
			tion.
24	SCAN_EN	I	Scan Enable. When high, internal chip scan is enabled. This signal is only used for
			production testing. Tie to GND for normal operation.
25	PLL_VDD	P	3.3 V Analog Power Supply for PLL.
26	PLL_VSS	P	Analog Ground for PLL.
27	DPLS	I/O	USB DPLS Signal.
28	DMNS	I/O	USB DMNS Signal.
29	VDD	P	3.3 V Power Supply.
30	GND	P	Ground.
31	TEST	I	Test. This signal is only used for production testing. Tie to GND for normal opera-
			tion.
32	RESET	I	Reset. This signal is only used for production testing. Tie to GND for normal opera-
			tion.
33	TST_RST	I	Test Reset. This signal is only used for production testing. Tie to GND for normal
			operation.
34	SK	O	Serial ROM Clock.
35	CS	O	Serial ROM Chip Select.
36	DIO	I/O	Serial ROM Data Signal.
37	NUSB_RESET	O	USB Reset (Active-Low).Indicates USB reset condition.
38	VDD	P	3.3 V Power Supply.
39	GND	P	Ground.
40	SUSPEND	O	Suspend. Indicates USB bus in suspend.
41	PLH	I	Parallel Port Peripheral Logic High Signal.
42	HLH	O	Parallel Port Host Logic High Signal.
43	NSTROBE	O	Parallel Port nStrobe Signal (Active-Low).
44	PDATA[0]	I/O	Parallel Port Data Signal.

* An N before symbol names indicates active-low.

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