Datasheet
SLLS019F − JUNE 1986 − REVISED JULY 2004
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
RECEIVE/TRANSMIT
CONTROLS
BUS-MANAGEMENT CHANNELS DATA-TRANSFER CHANNELS
DC TE ATN
†
ATN
†
SRQ REN IFC EOI DAV NDAC NRFD
(CONTROLLED BY DC) (CONTROLLED BY TE)
H H H
R
T
R
R
T
T
R
R
H H L
R TRR
R
T RR
L L H
T
R
T
T
R
R
T
T
L L L
T RTT
T
R TT
H L X R T R R R R T T
L H X T R T T T T R R
H = high level, L = low level, R = receive, T = transmit, X = irrelevant
Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving
is from the bus side to the terminal side.
Data transfer is noninverting in both directions.
†
ATN is a normal transceiver channel that functions additionally as an internal direction control or talk
enable for EOI whenever the DC and TE inputs are in the same state. When DC and TE are in opposite
states, the ATN channel functions as an independent transceiver only.