TMS320 datasheet(25/69 Pages) TI

25 / 69 page

TMS32020

SPRS010B — MAY 1987 — REVISED NOVEMBER 1990

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

RS, INT, BIO, AND XF TIMING

switching characteristics over recommended operating conditions (see Note 3 and 8)

PARAMETER

MIN

TYP

MAX

UNIT

td(RS)

CLKOUT1 low to reset state entered

td(IACK)

CLKOUT1 to IACK valid

– 25

td(XF)

XF valid before falling edge of STRB

Q – 30

NOTES: 3. Q = 1/4tc(C).

8. RS, INT, and BIO are asynchronous inputs and can occur at any time during a clock cycle. However, if the specified setup time is met,

the exact sequence shown in the timing diagrams will occur.

timing requirements over recommended operating conditions (see Note 3 and 8)

MIN

NOM

MAX

UNIT

tsu(IN)

INT/BIO/RS setup before CLKOUT1 high

th(IN)

INT/BIO/RS hold after CLKOUT1 high

tf(IN)

INT/BIO fall time

15†

tw(IN)

INT/BIO low pulse duration

tc(C)

tw(RS)

RS low pulse duration

3tc(C)

† Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4tc(C).

8. RS, INT, and BIO are asynchronous inputs and can occur at any time during a clock cycle. However, if the specified setup time is met,

the exact sequence shown in the timing diagrams will occur.

HOLD TIMING

switching characteristics over recommended operating conditions (see Note 3)

PARAMETER

MIN

TYP

MAX

UNIT

td(C1L-AL)

HOLDA low after CLKOUT1 low

–25†

tdis(AL-A)

HOLDA low to address three-state

15†

tdis(C1L-A)

Address three-state after CLKOUT1 low (HOLD mode, see Note 9)

30†

td(HH-AH)

HOLD high to HOLDA high

ten(A-C1L)

Address driven before CLKOUT1 low (HOLD mode, see Note 9)

10†

† Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4tc(C).

9. A15-A0, PS, DS, IS, STRB, and R/W timings are all included in timings referenced as “address.”

timing requirements over recommended operating conditions (see Note 3)

MIN

NOM

MAX

UNIT

td(C2H-H)

HOLD valid after CLKOUT2 high

Q – 45

NOTE 3: Q = 1/4tc(C).

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