D7 D6 D5 D4 D3

D3

D2 D1 D0

D2

D6 D5

D7

D4

X

X

X

RANDOM DATA

X

X

X

D1 D0 X

SS/

SCK

MOSI

MISO

BIT #

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

7

6

5 4

3

2

1

0

START OF NEW COMMAND

RD

MDR1

DATA

WR

MDR1

BIT #

7

6

5

4

3

2

1

0

TRI-STATE

D7

D6 D5 D4 D3

D3

D2 D1 D0

D2

D6 D5

D7

D4

X

X

X

X

X

X

D1 D0

SS/

SCK

MOSI

MISO

BIT #

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

RD

CNTR

BIT #

7

6

5

4

3

2

1

0

BYTE 1

BYTE 0

CLR

STR

RANDOM DATA

7

6

5

4

3

2

1

0

TRI-STATE

NOTE: Write to MDR1 followed by Read from MDR1 operation

7366-112204-7

FIGURE 2. WR MDR1 - RD MDR1

FIGURE 3. RD CNTR - CLR STR

(MDR0 <7> = 0)

(MDR0 <7> = 1)

A

B

INDEX

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.

.

NOTE: Read CNTR (in 2-byte configuration) followed by CLR STR operation

.