Texas Instruments TMS320 - Manual (Page 38)

TMS320C25 50
SPRS010B — MAY 1987 — REVISED NOVEMBER 1990
POST OFFICE BOX 1443

HOUSTON, TEXAS 77001 38
RS, INT, BIO, AND XF TIMING
switching characteristics over recommended operating conditions (see Notes 3 and 16)
PARAMETER MIN TYP MAX UNIT
t
d(RS)
CLKOUT1 low to reset state entered 22 † ns
t
d(IACK)
CLKOUT1 to IACK valid -- 5 7 ns
t
d(XF)
XF valid before falling edge of STRB Q -- 8 ns
† Value derived from characterization data and not tested.
NOTES: 3. Q = 1/4 t
c(C)
16. RS, INT, BIO are asynchronous inputs and can occur at any time during a clock cycle.
timing requirements over recommended operating conditions (see Notes 3 and 16)
MIN NOM MAX UNIT
t
su(IN)
INT, BIO, RS setup before CLKOUT1 high 25 ns
t
h(IN)
INT, BIO, RS hold after CLKOUT1 high 0 ns
t
f(IN)
INT, BIO fall time 8 † 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 = 1/4 t
c(C)
16. RS, INT, BIO are asynchronous inputs and can occur at any time during a clock cycle.
HOLD TIMING
switching characteristics over recommended operating conditions (see Note 3)
PARAMETER MIN TYP MAX UNIT
t
d(CIL-AL)
HOLDA low after CLKOUT1 low 1 † 11 ns
t
dis(AL-A)
HOLDA low to address high-impedance 0 † ns
t
dis(CIL-A)
Address high-impedance after CLKOUT1 low (HOLD mode, see Note 17) 20 † ns
t
d(HH-AH)
HOLD high to HOLDA high 19 ns
t
en(A-CIL)
Address driven before CLKOUT1 low (HOLD mode, see Note 17) 8 † ns
† Value derived from characterization data and not tested.
NOTES: 3. Q = 1/4 t
c(C)
17. A15-A0, PS, DS, 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 -- 19 ns
NOTE 3: Q = 1/4 t
c(C)
ADV
ANCE
INFORMA
T
ION