HP 8560E, Service Manual

Page: 393 / 665

392 Chapter 7
ADC/Interface Section
A16 Assembly Fast ADC Circuits (8560E with Option 007)
32 K-Byte Static RAM
Refer to function block K of the A16 fast ADC assembly schematic
diagram in the HP 8560 E-Series Component Level Information.
The static RAM stores the flash ADC samples that are taken when the
fast ADC circuitry is in the "write" mode. When not in the "write" mode,
the static RAM is read by the CPU on the A2 controller assembly to
retrieve the fast ADC data.
The 8-bit Q bus connects the outputs of latch U30 to the data port of
static RAM U32.
Table 7-12 LP/Q Truth Table
Mode LP/Q 12M_SEL SCLK-1 LSAMPLE LPEAK P_LO P_HI
12MHz L H X X X X X
SAMPLE L X X L X X X
POS L L L H L L H
PEAK H L L H L H L
H L L H L L L
NEG H L L H H L H
PEAK L L L X H H L
(Pit) H L L H H L L
Clocking L L H H X X X
Peak/Pit
Sample