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Adv ance informa t ion, Tms320 second generation digital signal processors – Texas Instruments TMS320 User Manual

Page 25

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TMS320 SECOND GENERATION

DIGITAL SIGNAL PROCESSORS

SPRS010B — MAY 1987 — REVISED NOVEMBER 1990

POST OFFICE BOX 1443

HOUSTON, TEXAS 77001

25

RS, INT, BIO, AND XF TIMING

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

PARAMETER

MIN

TYP

MAX

UNIT

t

d(RS)

CLKOUT1 low to reset state entered

45

ns

t

d(IACK)

CLKOUT1 to IACK valid

-- 25

0

25

ns

t

d(XF)

XF valid before falling edge of STRB

Q -- 30

ns

NOTES: 3. Q = 1/4t

c(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

t

su(IN)

INT/BIO/RS setup before CLKOUT1 high

50

ns

t

h(IN)

INT/BIO/RS hold after CLKOUT1 high

0

ns

t

f(IN)

INT/BIO fall time

15

ns

t

w(IN)

INT/BIO low pulse duration

t

c(C)

ns

t

w(RS)

RS low pulse duration

3t

c(C)

ns

Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4t

c(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

t

d(C1L-AL)

HOLDA low after CLKOUT1 low

--25

25

ns

t

dis(AL-A)

HOLDA low to address three-state

15

ns

t

dis(C1L-A)

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

30

ns

t

d(HH-AH)

HOLD high to HOLDA high

50

ns

t

en(A-C1L)

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

10

ns

Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4t

c(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

t

d(C2H-H)

HOLD valid after CLKOUT2 high

Q -- 45

ns

NOTE 3: Q = 1/4t

c(C)

.

ADV

ANCE

INFORMA

T

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