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~ National ~ Semiconductor - Al Kossow's Bitsavers

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::8<br />

~ 5.0 Timing Waveforms<br />

z<br />

Read and Write Cycles<br />

ALE ---.I<br />

READ {ADO_AD7 ------+-----+---'\1<br />

AD<br />

WRITE {ADO_AD7 ______________'\1<br />

Wii<br />

1'----""1<br />

Note: The internal write is made inactive by either the next ALE or CE going invalid<br />

TL/C/5593-4<br />

Modem Timing<br />

iNii (WRITE TO<br />

COMMAND REO)<br />

DTR, RTB<br />

'--4 £,.t_MD __<br />

TL/C/5593-5<br />

CTS, DCD, OSR<br />

Iill (STATUS -----~<br />

MASK BITS<br />

ENABLED FOR t.)<br />

AD (READ MODEM<br />

STATUS REG)<br />

TL/C/5593-6<br />

Wii (CLEAR<br />

MASK BIT)<br />

RT! (ASSUME<br />

STATUS BIT SET)<br />

---"'1'-4<br />

Wii (SET<br />

MASK BIT)<br />

- tSMI{~<br />

TL/C/5593-7<br />

TL/C/5593-B<br />

4-98

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