Ram Select Functional Block; U5 Register Bit Description (Write @ $D0X01) - Fluke 9100 Series Service Manual

Vector output i/o module

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the LOAD-RAM-HI- and LOAD-RAM-LO- signals that control the Vector RAM

Address Functional Block. For more information on the available

addresses and the signals they affect, see Table 2-6. Table 2-8

illustrates the U5 register bits used by the Output Control Functional

Block.

U10 also provides the START-ENA signal to the SSLOGIC Functional Block.

There are two conditions by which this signal can be made active. If the

CO-START output of U5 is low, setting bit 0 to a 1 when writing to

$D0X11 sets START-ENA high. If the CO-START output of U5 is set high,

START-ENA is not set high until RECV-ARM- is low.

The RECV-ARM- signal comes from the Main PCA and is generated by U23

(74HCT138). RECV-ARM- goes low when ALLCHIP- is low, D0 is low, D1 is

high, and A1 through A3 are low (i.e., the input section is armed). This

permits the input section to be armed at the same time the output

section receives the START-ENA, so that both input and output sections

can be started simultaneously.

To clear START-ENA, the CO-START line must be set low and a WRITE @

$D0X11 must be performed with bit 0 set to 0.

Table 2-8.

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BIT

SIGNAL

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LOAD-RAM-

COUNTER-ENA-

HSIN-POL-

CO-START

DRV/LD-

MUX2*1

MUX1*

MUX0*

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*MUX2

*MUX1

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(other)

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