Agilent Technologies 35670-90066 manual Prw, Vbatt

Agilent 35670A			Voltages and Signals
			A9 NVRAM
Signal Name	Pin(s)	A8 P2	A9 J1
PROTCTn	A9	S	•
PA18	C16	S	•
PA19	A4	S	•
PA20	A12	S	•
PA21	B16	S	•
PRW	A3	•	•
VBATT	A13, A14, A15	S	•
+5	A10, A11, B11, C11	•	•
Gnd	A1, A5, B5, C5, A7, A8	•	•

SThis assembly is the source of the signal.

• This assembly uses the signal.

⇔ This signal is bidirectional.

— This assembly does not use this signal.

BASn	Buffered Address Strobe — This line pulses low when a valid address is on the processor
	address bus (PA0 — PA21).
MD24 — MD31	Memory Data Bus — This is the buffered processor data bus from the A7 CPU assembly. This
	bus is further buffered on the A8 Memory assembly.
NVPRESn	NRAM Present — A low on this line indicates that the A9 NVRAM assembly is connected to
	the A8 Memory assembly. This line is checked only during manual troubleshooting
	procedures.
OPRAMn	Optional RAM — A low on this line enables the battery-backed static RAM on the
	A9 NVRAM assembly.
PA0 — PA21	Processor Address Bus — This is the processor address bus from the A7 CPU assembly. This
	bus is buffered on the A8 Memory assembly.
PROTCTn	Protect — A low on this line disables the battery-backed static RAM on the A9 NVRAM
	assembly. This line pulses low during power-up and power-down, when the A7 CPU
	assembly’s microprocessor is externally reset, and when +5 volts on the A8 Memory assembly
	is too low.
PRW	Processor Read/Write — This line is high when the current memory cycle is a read and low
	when the current memory cycle is a write.
VBATT	Battery Voltage — This line provides the power to the battery-backed static RAM on the
	A9 NVRAM assembly. When the analyzer is on, the +5 volts on the A8 Memory assembly
	provides the power for this line. When the analyzer is off, the battery on the Memory assembly
	provides the power for this line. Since power is applied to the static RAM even when the
	analyzer is off, the static RAM is non-volatile.

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