RD

CS

RS

CHS

DB

VALID

DATA

VALID DATA

FIGURE 2. READ CYCLE

INPUT DATA

INPUT DATA

WR

CS

RS

CHS

DB

FIGURE 3. WRITE CYCLE

PCK

(MDR0 <7> = 0)

(MDR0 <7> = 1)

A

B

INDX

Note 1

Note 2

Note 1. Positive index coincident with both A and B high.

Note 2. Positive index coincident with both A and B low.

Note 3. The index logic level in the above examples are inverted for negative index.

FIGURE 4. PCK, A, B and INDX

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