GMS90C320

OCT. 2000 Ver 1.2

25

AC Characteristics

Explanation of the AC Symbols

Each timing symbol has 5 characters. The first character is always a ‘t’ (stand for time). The other characters, depending on

their positions, stand for the name of a signal or the logical status of that signal. The following is a list of all the characters

and what they stand for.

A: Address

C: Clock

D: Input Data

H: Logic level HIGH

I: Instruction (program memory contents)

L: Logic level LOW, or ALE

P: PSEN

Q: Output Data

R: RD signal

T: Time

V: Valid

W: WR signal

X: No longer a valid logic level

Z: Float

For example,