32 IMP2B 3U cPCI Single Board Computer
Publication No. IMP2B-0HH/5
3.15.9
Control Register 2 – Offset 0x0000000E
Table
3-17 Control Register 2
Bits
Mode
Description
Notes
0
Read/Write COM1/COM2 Transceiver Enable
0 = Disabled (default)
1 = Enabled
1
Read/Write COM1 Mode
0 = RS232
1 = RS422
Defaults to RS232 unless COM1 RS422 termination is fitted,
then this bit defaults, and locks, to ‘1’
5 to 2
Reserved
6
Read/Write COM2 Mode
0 = RS232
1 = RS422
Defaults to RS232 unless COM2 RS422 termination is fitted,
then this bit defaults, and locks, to ‘1’
10 to 7
Reserved
11
Read/Write COM1/COM2 transceiver loopback mode 0 = Enabled
1 = Disabled (default)
12
Read/Write BIT Fail LED (Red)
0 = LED off
1 = LED lit (default)
13
Read/Write BIT LED 1 (Yellow)
0 = LED off (default)
1 = LED lit
14
Read/Write BIT LED 2 (Yellow)
15
Read/Write BIT Passed LED (Green)
3.15.10
Test Registers
Table
3-18 Test Registers
Register Offset
Bits
Mode
Description
Notes
Test 1a
0x00000010 15 to 0 Read only Test pattern 0xAAAA Displays the second 16 bits of the Flash Protection Password if the
Flash Protection Password Unlock Link (P3 1-2)
Test 1b
0x00000012 15 to 0 Read only Test pattern 0xAAAA Displays the first 16 bits of the Flash Protection Password if the
Flash Protection Password Unlock Link (P3 1-2)
is fitted
Test 2a
0x00000014 15 to 0 Read only Test pattern 0x5555
Displays the third 16 bits of the Flash Protection Password if the
Flash Protection Password Unlock Link (P3 1-2)
Test 2b
0x00000016 15 to 0 Read only Test pattern 0x5555
Displays the fourth 16 bits of the Flash Protection Password if the
Flash Protection Password Unlock Link (P3 1-2)
Test 3a
0x00000018 15 to 0 Read only Test pattern 0x4950
“IP” in ASCII
Test 3b
0x0000001A 15 to 0 Read only Test pattern 0x3242
“2B” in ASCII
3.15.11
Scratchpad Registers
Table
3-19 Scratchpad Registers
Register
Offset
Bits
Mode
Description
Notes
Scratchpad 1
0x0000001C 15 to 0 Read/Write Upper 16 bits Reset Value = 0x0000
Scratchpad 2
0x0000001E 15 to 0 Read/Write Lower 16 bits Reset Value = 0x0000