HP 3562A Service Manual page 354

M OD E L 3S62A
I RQT5 L
I RQT6L
KYB R D L
LCNV
LDO to LD1 5
LDCH1 L
LDCH 2 L
LDSRCL
I N TE RRU PT R E Q U E ST 5
Active Low
I nterrupt req uest l i ne from the A6 Digital Filter Contro l l e r to the A2
System C P U . T h i s is an open col l ector signal.
I NT E R R U PT R E Q U E ST 6
Active Low
I nterrupt req uest l i ne from the AB G lobal RAM to the A2 System C P U .
This is a n open col lector sign a l .
K EYBOARD
Active Low
S ignal from the A2 System C P U which selects the A1 S Keyboard . The
system processor uses this l i ne along with A1 L and A2 L to add ress the
keyboard .
LOCAL AID CO NV E RT
(A32, A34 T P606)
This signal is used by the A32 ADC 1 and the A34 ADC 2. T h e ADC
contro l l e r sends this signal to the A/D converter IC to start converti ng.
When both assem b l ies are i nsta l l ed, this s ignal also goes to the
A32 ADC 1 ass e m b ly's AID converter l e .
LOCAL DATA B U S
Thes e b i d i rectional data l i nes are used by the A S Digital F i l ter and
the A6 D i gital F i lter Contro l l er. D u ring a AS Digital F i lter read/write
operation, these data l ines are the inverted version of the system data
bus.
LOAD C H AN N E L 1
LOAD C H A N N E L 2
Active Low
Signal from the A1 D igital Source that l atches command data word
G-J TLD i nto the A33, A35 i n put assem b i ies and the A32, A34 ADC
assemb l i es.
Active ow
Si gnal from the A2 System C P U i n d i c ati ng data is transferri n g on the
l ower half of the system d ata bus (DO to D7). When LDSL goes l ow
for a read cycle, the A2 System CPU is expecting val id data to be placed
on the lower h a l f of the data bus. I n the write cycle a l ow on L D S L
indi cates there i s va l id data on the l ower half of the system d ata b u s .
LOAD ANALOG SOURC E
Active Low
Signal from the A1 Digital Sou rce that l atches comm and data word
CNTLD into the A30 analog sou rce's sh ift reg ister./
C I RCU I T D E SC R I PT I O N S
6-1 39