SMJ320LC549 Datasheet, PDF (32/52 Pages) Texas Instruments – FIXED-POINT DIGITAL SIGNAL PROCESSOR

SMJ320LC549
FIXEDĆPOINT DIGITAL SIGNAL PROCESSOR
SGUS032B – OCTOBER 2002 – REVISED MAY 2003
instruction acquisition (IAQ), interrupt acknowledge (IACK), external flag (XF), and TOUT timings
switching characteristics over recommended
[H = 0.5 t_c(CO)] (see Figure 18)
PARAMETER
td(CLKL-IAQL) Delay time, IAQ low from CLKOUT low
td(CLKL-IAQH) Delay time, IAQ high from CLKOUT low
td(A)IAQ
Delay time, address valid before IAQ low
td(CLKL-IACKL) Delay time, IACK low from CLKOUT low
td(CLKL-IACKH) Delay time , IACK high from CLKOUT low
td(A)IACK
Delay time, address valid before IACK low
th(A)IAQ
Hold time, address valid after IAQ high
th(A)IACK
Hold time, address valid after IACK high
tw(IAQL)
Pulse duration, IAQ low
tw(IACKL)
Pulse duration, IACK low
*Not production tested.
operating
conditions
for IAQ and
549-60
MIN MAX
–1*
5
–1*
5
4*
–0.5*
7
–0.5*
7
5*
–3*
–5*
2H–3*
2H–3*
IACK
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLKOUT
A[15:0]
td(CLKL-IAQL)
IAQ
IACK
td(A)IAQ
tw(IAQL)
td(CLKL-IACKL)
td(A)IACK
tw(IACKL)
td(CLKL-IAQH)
th(A)IAQ
td(CLKL-IACKH)
th(A)IACK
MSTRB
Figure 18. Instruction Acquisition (IAQ) and Interrupt Acknowledge (IACK) Timing
32
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