HP 3562A, Service Manual

Page: 344 / 570

MOD E L 3562A
A1 L to A23L
ARM L
ASL
ATN
B2GDSl
BA1 L to BA4L
C I RC U I T DESCR I PT I O N S
SYSTE M ADDRESS BUS
Active Low
These add ress l i nes from the A2 System CPU are part of the system
bus. These addresses along with VI OL, ASL, UDSL, and LDSL are used
to access various registers within the fol l owing assemb l ies:
Lines
A1 to A2
A1 to AB
A9 to A23
ARM
(A1 J 705-1 )
Assemblies
A 1 5 Keyboard
A1 Digital Sou rce
A3 Program ROM
A4 Local Oscillator
A6 Digital Filter Control ler
A7 Floating Point Transform Processor
AB G lobal RAM
A9 Fast Fou rier Processor
A3 Program ROM
Active Low Low Signal from the A6 D igital Filter Control ler to the A1
Digital Sou rce to start a triggered measu rement process. ARML stays
asserted until the rising edge of BFST.
ADDRESS STRO BE
Active Low
This is the system add ress bus strobe from the A2 System CPU
assem bly. When the Add ress strobe signal is low, a valid add ress is
on the system bus.
ATTENTION
S ignal to and from the A2 System CPU to the A22 H P-I B. This is the
control l ine that places the H P-I B in the "Command Mode".
H P 1 345A G LO BAL DATA STRO B E
B U F F E R E D ADDRESS L I N E S
Active Low
These signals are the buffered version of the lower fou r system address
lines of the A6 Digital Fi lter Control ler. They are used by the AS Digital
Filter assem bly for command decod ing.
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