Xerox FaxCentre 2121 Service Manual page 214

Wiring Diagrams
ECP: Parallel Interface to PC
Pin
1
2 DATAECP0
3 DATAECP1
4 DATAECP2
5 DATAECP3
6 DATAECP4
7 DATAECP5
8 DATAECP6
9 DATAECP7
10
11 PRPHACK
12 ACKRVRS
13
14 HOSTACK
32 PRPHREQ
31 RVRSREQ
36 ECPACTIVE
18
17-19
20
21
22
23
24
25
26-27-28-29-30
15-33-34-35
USB: USB Interface
Pin
1 VBUS_USB
2
3
4
7-8
Table 5: Parallel Interface to PC
Signal Input/Output
HOSTCLK
PRPHCLK
XFLAG
ERREUR
GND
GND
GND
GND
GND
GND
GND
GND
-
Table 6: USB Interface
Signal
USBN
USBP
GND
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O Acknowledgment of reverse request
O Indicates that ECP mode is supported
I
O
I
O
-
-
-
-
-
-
-
-
-
-
Input/Output
I
I/O
I/O
I/O
11/06
Use
Data clock (forward)
Data bus LSB
Data bus bit 1
Data bus bit 2
Data bus bit 2
Data bus bit 4
Data bus bit 5
Data bus bit 6
Data bus MSB
Data clock (reverse)
Data acknowledgment (forward)
Data acknowledgment (reverse)
Data drive request
Data drive enable
Mode select
Proprietary
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Not Connected
Use
Supply from master
Differential pair
Differential pair
Ground
FaxCentre 2121/2121L