Parallel I/Ocabling; Serial I/Ocabling - Intel iSBC 80 Hardware Reference Manual

iSBC 80/30
2-29. PARALLEL I/O CABLING
Parallel I/O ports E8, E9, and EA are controlled by the
Intel 8255A Programmable Peripheral Interface (PPI) and
interfaced via edge connector J 1. Parallel I/O ports 1 and 2
are controlled by the optional Intel 8041/8741 Universal
Peripheral Interface and interfaced via edge connector J2~
(Refer to figure 1-1.) Pin assignments for J 1 and· J2 are
listed in tables 2-19 and 2-20, respectively; dc charac-
teristics of the parallel I/O signals are given in table 2-21.
Table 2-2 lists some 50-pin edge connectors that can be
used for interface to 11 and J2; flat crimp, solder, and
wirewrap connector types are listed.
The transmIssion path from the I/O source to the iSBC
80/30 should be limited to 3 meters (10 feet) maximum.
The. following bulk cable types (or equivalent) are rec-
ommended for interfacing with the parallel I/O ports:
a. Cable, flat, 50-conductor, 3M 3306-50.
b. Cable, flat, 50-conductor (with ground plane), 3M
3380-50.
c. Cable, woven, 25-pair, 3M 3321-25.
An Intel iSBC 956 Cable Set, consisting of two cable
assemblies, is recommended for parallel I/O interfacing.
Table 2-19. Connector
Jl
Pin Assignments
Pin* Function
Pin*
Function
1 Ground 2 Port E9 bit 7
3
I
4
Port E9 bit 6
5 6 Port E9 bit 5
7 8 Port E9 bit 4
9
10
Port E9 bit 3
11
12
Port E9 bit 2
13 14 Port E9 bit 1
15 Ground 16 Port E9 bit 0
17 Ground 18 Port EA bit 3
19
I
20
Port EA bit 2
21 22 Port EA bit 1
23 24 Port EA bit 0
25 26 Port EA bit 4
27 28
port
EA bit 5
29
30
Port EA bit 6
31 Ground 32 Port EA bit 7
33
Gror
34
Port E8 bit 7
35 36
Port E8 bit 6
37
38
Port E8 bit 5
39 40 Port E8 bit 4
41 42 Port E8 bit 3
43 44 Port E8 bit 2
45 46 Port E8 bit 1
47 Ground 48 Port E8 bit 0
49 Ground
50 EXT INTRO/
*AII odd-numbered pins (1, 3, 5, ... 49) are on com-
ponent. side of the board. Pin 1 is the right-most pin
when viewed form the component side of the board with
the extractors at the top.
Preparation for Use
Both cable ,:!ssemblies consist of a 50-conductor flat cable
with a 50-pin PC connector at one end. When attaching
the cable to 11 or J2, be sure that the connector is oriented
properly with respect to pin 1 on the edge connector.
(Refer to the footnotes in tables 2-19 and
2~20.)
2-30. SERIAL I/O CABLING
Pin assignments and signal definitions for RS232C serial
I/O interface are listed in table 2-10. An Intel iSBC 955
Cable Set is recommended for RS232C interfacing. One
cable assembly consists of a 25 -conductor flat cable with
a 26-pin PC connector at one end and an RS232C inter-
face connector at the other end. The second cable assem-
bly includes an RS232C connector at one end and has
spade lugs at the other end; the spade lugs are used to
interface to a teletypewriter. (Se·e Appendix B for
ASR-33 TTY interface instructions.)
For OEM applications where cables will be made for the
iSBC 80/30, it is important to note that the mating connec-
tor for 13 . has 26
piJ?~
.whereas the RS232C connector has
25 pins. Consequently, when connecting the 26-pin- mai--
ing connector to 25-conductor flat cable, be sure that the
Table 2-20. Connector J2 Pin Assignments
Pin* Function Pin*
Function
1 Ground 2 Port 2 bit 7
3
I
4 Port 2 bit 6
5 6 Port 2 bit 5
7 8 Port 2 bit 4* *
9 10 Port 2 bit 3* *
11 12 Port 2 bit 2* *
13 14 Port 2 bit 1* *
15
Ground 16 Port 2 bit 0* *
17 Ground 18 TO Input
19
I
20 T1 Input
21 22 Not Used
23 24 Not Used
25
·26
Not Used
27 28 Not Used
29 30 41 RS232 Out* *
31 Ground 32 41 RS232 In* *
33 Ground 34 Port 1 bit 7
35
' I
36 Port 1 bit 6
37 38 Port 1 bit 5
39 40 Port 1 bit 4
41
42
Port 1 bit 3
43
44
Port 1 bit 2
45 46 Port 1 bit 1
47 Ground 48 Port 1 bit 0
49
Ground 50 EXT INTR1/
*AII odd-numbered pins (1, 3, 5, ... 49) are on com-
ponent side of the board. Pin 1 is the right-most pin
when viewed from the component side of the board with
the extractors at the top.
* *Jumpered pin or function. Refer to figure 5-2 sheet 5.