HP 3562A Service Manual page 353

C I RC U I T D E SCR I PT I ONS
H LFSCl1
H L FSCL2
H p·I D
I N D LKEMPTY
I N PUT1
I N PUT2
I F C
I R QT3L
I RQT4 L
6-1 38
H ALFSCA L E C HA N N E L 1
H A L FSCA L E C H A N N E L 2
(A32; A34 TPS03)
These s i g n a l s are status signals from the A32, A34 Analog D igital
Converters and are asserted whenever the ana log i n put exceeds half­
· range i n a m p l itude. T hey are l atched i nto the AS D i g ital F i l ter and
can be read by the A2 System CPU as part of the d i g ital fi lter status
word . ,:H L FSC L 1 and H LFSC L2 a lso go to the
the halfsca le L E D .
H P-I B
T h i s is the H P-I B i n p u t from the rear panel to the A22 H P-I nterface
B u s assem bly. The A22 H P-I B connects the rear panel i nput to the A2
System C P U asse m b ly.
PARA L L E L I N PUT DATA B LOCK EMPTY
This signaL is from the AS Digital Fi lter to the A6 Dig ital Fi lter Control ler.
I N B L K E M PTY is u sed when para l l e l data from the A8 G l obal RAM i s
used i n stead o f s e r i a l data from the A32 A DC 1 o r A34 ADC 2
assem b l ies. T h i s s ig n a l goes h igh when the c u rrent i n put b l ock of the
A8 G lobal RAM d ata is received by the AS D i g i ta l Fi lter. The positive
' transition of this s i g n a l sets the correspond i n g i nterru pt fl ag on the
A6 D i gital Fi lter Control ler.
C H AN N E L 1 A N A LOG O UT
CHAN N E L 2 A N A LOG O U T
(A33, A 3 S T P400)
These s i g n a l s are the cond itio ned front panel i n put s i g n a l s from the
A33; A3S I n put assem b l ies to the A32, A34 Anal og D igital Converters.
I N T E RFAC E C L E A R
Signal to a n d from t h e A 2 System CPU to t h e A22 H P-I B . W h e n I FC
is set a l l talkers and l i steners on the H P-I B are u n addressed, and
contro l lers go to the' i n active state.
This open col lector s i g n a l is also used by the A2 progra m m a b l e timer
modu le.
I NT E RRU PT R EQ U E ST 3
Active Low
I nterru pt req uest l i ne from the A7 Fl oating Po i nt T ransform P rocessor
to the A2 System C P U . T h i s is an open col l ector s i g n a l .
I NT E R R U PT R E Q U E ST 4
Active Low
I nte rrupt requ est l i ne from the A9 Fast Fourier Processor to the A2
System C P U . T h i s i s an open col lector s i g n a l .
MOD E L 3S62A
A1 S
Keyboard to tu rn on
7\2 CPU.