Phase #14 Dual Uart Diagnostics - AT&T 3B2 Off-Line Diagnostic Manual

Version 3 Hardware System Board Diagnostics - - - - - - - - - - - - - - - - - - - - - -
Phase #14
Phase Name:
Type:
Function:
Tests:
Dual UART Diagnostics
2681 Dual Asynchronous Receiver/Transmitter (DUART) Tests (duarLtst)
Interactive
The DUART is tested in the local loopback mode by transmitting and receiving
characters. The appropriate Status bits are checked as well as the correct
transmission and reception of the data. The Command and Mode registers are
checked for read and write capability.
The following table lists the tests that are run in this phase:
SIDE TEST NUMBER TEST FUNCTION
A, B
1-16, 17-32
A, B
33-36, 37-40
A, B
41-47,48-54
A, B 55-57, 58-60
A,B 61-62, 63-64
A, B
65-66, 67-68
A, B
69-70, 71-72
A 73-74, 75-77
B 78-79, 80-82
A 83-84
B 85-86
A 87
B 88
A
89
B
90
A, B 92-93
Time:
Warnings:
Notes:
These tests walk a one through zeros in Mode register 2, and they walk a zero
through ones in Mode register 1.
These tests check the Receive Data bit in the Status register so that it may be used as
a flag in subsequent tests. This is done by Tests 33 through 37 and 35 through 39.
At the same time, the ability to transmit and receive a character is checked by Tests
34 through 38 and 36 through 40.
These tests walk a one through zeros at seven different baud rates.
These tests walk a one through zeros with 7, 6, and 5 Data bits (8 bits already used).
These tests check even parity and no parity (odd parity already tested).
These tests transmit characters with both 1 and 1.5 Stop bits (2 already tested).
These tests check the Transmitter Empty and Transmitter Ready bits in the Status
register for correct operation.
These tests check the Received Break and Parity Error Send/Receive bits. They also
check the Overrun and First-In-First-Out (FIFO) Full Send/Receive bits.
These tests check the Received Break and Parity Error Send/Receive bits. They also
test the Overrun and FIFO Full Send/Receive bits.
These tests confirm that INTRN is activated when RxRDY A occurs and when
TxRDY A occurs.
These tests confirm that INTRN is activated when RxRDY B occurs and when
TxRDY B occurs.
This test confirms that INTRN is activated when FFULL A occurs.
This test confirms that INTRN is activated when FFULL B occurs.
This test confirms that INTRN is activated when Delta Break A is received.
This test confirms that INTRN is activated when Delta Break B is received.
These tests confirm the FIFO Shift register capacity.
5 seconds
None
The system will specify that .. CONSOLE must be connected to console side of
DUART, and CONTTY port must be disconnected."
3-110 OFF-LINE DIAGNOSTIC MANUAL