HP 3562A, Service Manual

Page: 345 / 570

C I RC U I T D E SC R I PTIONS
MOD E L 3S62A
6-1 30
BFST
BUFFER START
(A1 TP9)
This signal from the A1 Digital Sou rce goes to the A6 digital fi lter and
the A4 Local Oscil lator. When the instru ment is in the triggered mode,
BFST marks the f i rst sample of the data block. After a trigger and
sam ple clock are received by the digital source it sends the BFST s ignal
to the digital fi lter control ler tel l ing it to start taking data. The local
osc i l l ator
u
ses th is signal to l atch the phase of the sinusoidal output
to the AS Digital Filter.
B LDSL
BUFFE RED LOW E R DATA STRO B E
Active Low
B LK1 F U LLH
B LK2F U LLH
B LK3F U LLH
B RESETL
BUDSL
BWRITE L
CA LTR I G
This signal is the buffered version o f the LDS l i ne of the A 6 D igital
Filter Contro ller. It is used by the AS Digital Fi lter assembly for
command decod i ng.
B LOCK 1 FULL
B LOCK 2 F U L L
BLOCK 3 F U L L
Active high
These signals are from the AS Digital Fi lter to the A6 Digital Filter
Control ler. When the imaginary filter auxiliary data block (BLK2FU LL)
or the unfiltered data block ( B LK3FU LL) is f u l l , the positive going
transition of these signals sets the correspond i ng interru pt flag f l i p­
flop on the A6 D igital Fi lter Control ler.
BUFFE RED R E S E T
Active Low
This signal is from the A6 Digital Filter Control ler to the AS Digital
Filter assembly. It is the buffered version of the system bus l i ne RESETL.
BUFFERED U P PE R DATA STRO BE
Active Low
This signal is from the IA�6 Dig ita! Fi lter Control ler to the i\5 D igital
Fi lter assem bly. It is the buffered version of the system bus line U DSL.
enables the A30 Analog Sou rce when i n bu rst mode.
BUFFERED "WR I T E
Active Low
This signal is from the A6 Dig ital Filter Contro l ler to the AS D i g ital
Fi lter assembly. It is the buffered version of the system bus l ine
W R I T E L. The AS D igital Filter uses this signal for command decod i ng
and register read ing and writi ng.
CAL TRIGG E R
Signal from the A30 Analog Source to the A32 trigger assemb ly. T h i s
signal i s a p u l se which is synchronous with the cal ibrator. I t is u sed
i n the calibration to calculate phase.