Line Drivers And I/O Terminators; Installation Procedure; Compatible Line Drivers - Intel iSBX 350 PARALLEL MULTIMODULE BOARD Hardware Reference Manual

Preparation for Use iSBX 350
Table 2-5. Port Configuration Jumpers For Multimodule
™
Board (Continued)
Driver (D)/
Jumper Configuration
Port
Mode
Terminator (T) I
Restrictions
Delete Add Effect Port
X1
o
Output D:XU3
None Same as for Port X2 (upper) mode
XO
Same as for Port X2
(upper) (latched)
o
Input.
(upper) Mode 0 Input.
X1
o
Output
D:XU4
None
Same as for Port X2 (lower) Mode
X2
Same as for Port X2
(lower) (latched)
*Default jumper connected at the factory.
2-11. LINE DRIVERS AND
I/O TERMINATORS
o
Input.
All 24 I/O lines on the Multimodule board can be
buffered with drivers or terminators at sockets XUl,
XU2, XU3, XU4, XU5, and XU6 on the board. The 24
I/O lines may be divided into three groups of eight.
The group labeled Port A is connected to the
socketed 8226 Bidirectional Bus Driver devices.
Unlike Port B and Port C, Port A may be used in the
"as-shipped" configuration with no additional
components.
NOTE
The 8226's are inverting devices. You may
wish to substitute Intel 8216 non-inverting
bidirectional bus driver devices, as required
by the application.
Port B and Port C each interface to two sockets
compatible with any 7400 pinout type driver. Table
2-6 lists some of the common drivers and their
characteristics.
Table 2-6. Compatible Line Drivers
Driver
Characteristic 1 IOl (mA)2
IOH
(mAp
7438 I,OC 48
-
7437
I
48 -1.2
7432 NI 16
-0.8
7426 I,OC 16 -
7409 NI,OC 16
-
7408 NI 16 -0.8
7403 I,OC 16 -
7400 I 16 -0.4
NOTES:
1. I
=
Invertin ; OC
=
0 en Collector; NI
=
Non Invertin .
9 P
2. IOl specified for VOL = 0.4 Volt.
3. IOH specified for V OH
=
2.4 Volts.
The Port B and Port C sockets are also compatible
with two special terminator resistor packs available
2-8
(lower) Mode 0 Input.
through Intel; the iSBC 901 Terminator and the
iSBC 902 Pull-Up. The packs are shown in figure 2-3
and useful in interfacing to the Intel 8255A-5 PPI
device in an input application.
220 ohms
+5V~
____________
~~
____
~
______
o
L
W0
iSBC 901'· DIVIDER
lK ohm
+5V------------~AIv\A~------------O
iSBC 902'· PULL-UP
Figure 2-3. Compatible 1/0 Terminators
Each of the Port C lines also includes two wirewrap
posts that provide the flexibility needed to support
all three modes of operation of the PPI. Uses for the
wirewrap posts are contained in section 2-10.
2-12.
INSTALLATION PROCEDURE
The Multimodule board mounts onto the host iSBC
microcomputer. Install the board as follows:
a. ,with a non-metaI1;t inch x 6/32 screw, secure the
l/:l
inch plastic spacer to the host iSBC micro-
computer as shown in figure 2-4.
b.
Locate pin 1 on the iSBX bus connector (PI) and
align it with pin 1 of the iSBX bus connector on
the host iSBC microcomputer.
c. Align the Multimodule board mounting hole
with the spacer on the host iSBC microcomputer;
reference figure 2-1.
d. Gently press the two boards together until the
connector seats.