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TMS320 データシート(PDF) 25 Page - Texas Instruments

部品番号 TMS320
部品情報  SECOND-GENERATION DIGITAL SIGNAL PROCESSORS
PDF  69 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TMS320 データシート(HTML) 25 Page - Texas Instruments

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TMS32020
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
td(RS)
CLKOUT1 low to reset state entered
45
ns
td(IACK)
CLKOUT1 to IACK valid
– 25
0
25
ns
td(XF)
XF valid before falling edge of STRB
Q – 30
ns
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
50
ns
th(IN)
INT/BIO/RS hold after CLKOUT1 high
0
ns
tf(IN)
INT/BIO fall time
15†
ns
tw(IN)
INT/BIO low pulse duration
tc(C)
ns
tw(RS)
RS low pulse duration
3tc(C)
ns
† 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†
25
ns
tdis(AL-A)
HOLDA low to address three-state
15†
ns
tdis(C1L-A)
Address three-state after CLKOUT1 low (HOLD mode, see Note 9)
30†
ns
td(HH-AH)
HOLD high to HOLDA high
50
ns
ten(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 = 1/4tc(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
ns
NOTE 3: Q = 1/4tc(C).



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