C

FULL

EMPTY

D0–D17

RESET

PEN

Q0–Q17

AF/AE

W2

DE

HF

OE

LDCK

UNCK

W1

W2

H

I

W1

1

0

A

1

0

G

F

W

(Y+2)

W

(Y+1)

W

(X+1)

B

Define the AF/AE Flag Using the Default Value of X and Y

Don’t Care

Figure 1. Write, Read, and Flag Timing Reference