AT&T 3B2 Off-Line Diagnostic Manual page 416

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Phase #18 - PORTS-DUART 1 Internal Loop
Phase Name:
Type:
Function:
Tests:
PORTS - DUART (SC2681) 1 Internal Loop Test (duartl_l)
Demand
This phase verifies the ability of Dual Universal Asynchronous
Receiver /Transmitter (DUART) 1 to do internal loop around at various baud
rates.
Tests 1 through 10 - check the internal loop of the ASCII characters through
DUART I, Port 1.
Tests 11 through 20 - check the internal loop of the ASCII characters through
DUART I, Port 2.
Test 21 - verifies the operation of the FIFO Full and Overrun Error bits for
DUART I, Port 1.
Test 22 - verifies the operation of the FIFO Full and Overrun Error bits for
DUART I, Port 2.
Test (23) - checks the ability of the DUART to send an interrupt when the
Receive Data register on DUART I, Port 1 is enabled and has received a
character.
Test (24) - checks the ability of the DUART to send an interrupt when the
Transmit Data register on DUART I, Port 1 is enabled and after a character has
been transmitted.
Test (25) - checks the ability of the DUART to send an interrupt when the
Receive Data register on DUART I, Port 2 is enabled and has received a
character.
Test (26) - checks the ability of the DUART to send an interrupt when the
Transmit Data register on DUART I, Port 2 is enabled and after a character has
been transmitted.
Test (27) - checks the ability of the DUART to send an interrupt when the
Receive buffer is full (3 characters) on DUART I, Port 1.
Test (28) - checks the ability of the DUART to send an interrupt when the
Receive buffer is full (3 characters) on DUART I, Port 2.
Test (29) - checks the ability of the DUART to send an interrupt when a
break character is detected on DUART I, Port 1.
Test (30) - checks the ability of the DUART to send an interrupt when a
break character is detected on DUART I, Port 2.
Test (31) - checks the ability of the DUART to send an interrupt when
"Counter Ready" is detected on DUART 1.
8·38 OFF·LINE DIAGNOSTIC MANUAL