Figure 3-1. Gpio Switch Settings (S1); Table 3-1. Gpio Pin Assignments; Table 3-2. Scsi Speed/Width Settings Using Gpio2:[1,2] - Emerson I/O MODULE IPMC7126E Installation And Use Manual

Chapter 3 Programming
The General Purpose I/O (GPIO) pin assignments for the SCSI Controller are shown in the
table below. A 1x4 switch (S1) is provided to configure GPIO pins 2 and 3. The factory default
setting shall be for Ultra-Speed and Ultra-Wide SCSI.

Table 3-1. GPIO Pin Assignments

GPIO Pin
GPIO1_MASTER_l
GPIO2
GPIO3
0, 4, 5, 6, 7, 8

Table 3-2. SCSI Speed/Width Settings Using GPIO2:[1,2]

SCSI Type
FAST SCSI
FAST SCSI
Ultra SCSI
Ultra SCSI

Figure 3-1. GPIO Switch Settings (S1)

S1-P1=0
S1-P2=0
S1-P3=0
S1-P4=0
SW1-P1 controls GPIO2 (Ultra/FAST SCSI) and SW1-P2 controls GPIO3 (Wide/Narrow SCSI
bus. SW1-P3 and SW1-P4 are No Connect. Select the SCSI characteristics of your
configuration according to the following table:
Width of Bus
Wide (16-bit) SCSI bus (P2 OFF)
Narrow (8-bit) SCSI bus (P2 ON)
16
IPMC7126E/7616E I/O Module Installation and Use (6806800A45B)
Direction Level
output 1
0
input 1
0
input 1
0
- -
Width
Narrow (8 bit)
Wide (16 bit)
Narrow (8 bit)
Narrow (16 bit)
1 8
ON
Ultra (P1 OFF)
40MB/second
20MB/second
Usage
SCSI LED; SCSI is not MASTER.
SCSI is MASTER.
SCSI speed; selectable by switch S1.
S1:1 OFF selects Ultra
S1:1 ON selects FAST (default).
SCSI bus width; selectable by switch S1.
S1:2 in OFF selects Wide-SCSI.
S1:2 in ON selects Narrow-SCSI.
Not used.
Speed
10MB/second
20MB/second
20MB/second
40MB/second
1
S1-P1=1
S1-P2=1
S1-P3=1
S1-P4=1
Fast (P1 ON)
20MB/second
10MB/second
8
ON