DSM2190F4 查看數據表（PDF） - STMicroelectronics

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DSM2190F4

DSM (Digital Signal Processor System Memory) For Analog Devices ADSP-2191 DSPs (3.3V Supply)

STMicroelectronics 

DSM2190F4

Table 25. AC Symbols for PLD Timing

Signal Letters

A

Address Input

C CEout Output

D Input Data

E

E Input

N Reset Input or Output

P

Port Signal Output

Q Output Data

R RD Input (read)

S

Chip Select Input, BMS, DMS, IOMS, or FSx

W WR Input (write)

B

VSTBY Output

M Output Macrocell

Example: tAVWL – Time from Address Valid to

Write input Low.

Signal Behavior

t

Time

L

Logic Level Low

H

Logic Level High

V

Valid

X

No Longer a Valid Logic Level

Z

Float

PW Pulse Width

Figure 28. Switching Waveforms – Key

WAVEFORMS

INPUTS

OUTPUTS

STEADY INPUT

STEADY OUTPUT

MAY CHANGE FROM

HI TO LO

MAY CHANGE FROM

LO TO HI

WILL BE CHANGING

FROM HI TO LO

WILL BE CHANGING

LO TO HI

DON'T CARE

OUTPUTS ONLY

CHANGING, STATE

UNKNOWN

CENTER LINE IS

TRI-STATE

AI03102

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