Pin information, Instant usb, Ieee – Lucent Technologies USS-720 User Manual
Page 30
5-4
Lucent Technologies Inc.
USS-720
Instant USB
Preliminary Data Sheet, Rev. 5
USB-to-
IEEE
1284 Bridge
September 1999
13
Pin Information
(continued)
Table 1. Pin Descriptions (continued)
Pin
Symbol*
Type
Name/Description
9
V
DD
5
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
V
DD
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
V
DD
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
V
DD
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.