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TMS32020
SPRS010B — MAY 1987 — REVISED NOVEMBER 1990
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
24
MEMORY AND PERIPHERAL INTERFACE TIMING
switching characteristics over recommended operating conditions (see Note 3)
PARAMETER MIN TYP MAX UNIT
t
d(C1-S)
STRB from CLKOUT1 (if STRB is present) Q – 15 Q Q + 15 ns
t
d(C2-S)
CLKOUT2 to STRB (if STRB is present) – 15 0 15 ns
t
su(A)
Address setup hold time before STRB low (see Note 5) Q – 30 ns
t
h(A)
Address hold time after STRB high (see Note 5) Q – 15 ns
t
w(SL)
STRB low pulse duration (no wait states, see Note 6) 2Q ns
t
w(SH)
STRB high pulse duration (between consecutive cycles, see Note 6) 2Q ns
t
su(D)W
Data write setup time before STRB high (no wait states) 2Q – 45 ns
t
h(D)W
Data write hold time from STRB high Q – 15 Q ns
t
en(D)
Data bus starts being driven after STRB low (write cycle) 0
†
ns
t
dis(D)
Data bus three-state after STRB high (write cycle) Q Q+30
†
ns
t
d(MSC)
MSC valid from CLKOUT1 –25 0 25 ns
†
Value derived from characterization data and not tested.
NOTES: 3. Q = 1/4t
c(C)
.
5. A15-A0, PS, DS, IS, R/W, and BR timings are all included in timings referenced as “address”.
6. Delays between CLKOUT1/CLKOUT2 edges and STRB
edges track each other, resulting in t
w(SL)
and t
w(SH)
being 2Q with
no wait states.
timing requirements over recommended operating conditions (see Note 3)
MIN NOM MAX UNIT
t
a(A)
Read data access time from address time (read cycle, see Notes 5 and 7) 3Q – 70
†
ns
t
su(D)R
Data read setup time before STRB high 40 ns
t
h(D)R
Data read hold time from STRB high 0 ns
t
d(SL-R)
READY valid after STRB low (no wait states) Q – 40 ns
t
d(C2H-R)
READY valid after CLKOUT2 high Q – 40 ns
t
h(SL-R)
READY hold time after STRB low (no wait states) Q – 5 ns
t
h(C2H-R)
READY hold after CLKOUT2 high Q – 5 ns
t
d(M-R)
READY valid after MSC valid 2Q – 50 ns
t
h(M-R)
READY hold time after MSC valid 0 ns
†
Value derived from characterization data and not tested.
NOTES: 3. Q = 1/4t
c(C)
.
5. A15-A0, PS, DS, IS, R/W, and BR timings are all included in timings referenced as “address”.
7. Read data access time is defined as t
a(A)
= t
su(A)
+ t
w(SL)
– t
su(D)R
.
ADVANCE INFORMATION