SMJ320C6701 Datasheet, PDF (30/62 Pages) Texas Instruments – FLOATING-POINT DIGITAL SIGNAL PROCESSOR

SMJ320C6701
FLOATING-POINT DIGITAL SIGNAL PROCESSOR
SGUS030 – APRIL 2000
INPUT AND OUTPUT CLOCKS
timing requirements for CLKIN^† (see Figure 8)
’C6701-14
’C6701-16
NO.
CLKMODE = x4 CLKMODE = x1 CLKMODE = x4 CLKMODE = x1
MIN MAX
MIN MAX
MIN MAX
MIN MAX
1 tc(CLKIN)
Cycle time, CLKIN
2
tw(CLKINH)
Pulse duration,
CLKIN high
28.4
*10.9
7.1
24
6
*3
*9.8
*2.7
3 tw(CLKINL)
Pulse duration,
CLKIN low
*10.9
*3
*9.8
*2.7
4 tt(CLKIN)
Transition time, CLKIN
*5
*0.6
*5
*0.6
† _{The reference points for the rise and fall transitions are measured at 20% and 80%, respectively, of VIH.}
*This parameter is not tested.
UNIT
ns
ns
ns
ns
CLKIN
1
4
2
3
4
Figure 8. CLKIN Timings
switching characteristics for CLKOUT1^ठ(see Figure 9)
NO.
PARAMETER
’C6701-14
’C6701-16
CLKMODE = x4
CLKMODE = x1
MIN
MAX
MIN
MAX
1 tc(CKO1)
Cycle time, CLKOUT1
*P – 0.7
2 tw(CKO1H) Pulse duration, CLKOUT1 high
*(P/2) – 0.5
3 tw(CKO1L) Pulse duration, CLKOUT1 low
*(P/2) – 0.5
4 tt(CKO1)
Transition time, CLKOUT1
‡ _{P = 1/CPU clock frequency in nanoseconds (ns).}
§ _{PH is the high period of CLKIN in ns and PL is the low period of CLKIN in ns.}
*This parameter is not tested.
*P + 0.7
*(P/2) + 0.5
*(P/2) + 0.5
*0.6
*P – 0.7
*PH – 0.5
*PL – 0.5
*P + 0.7
*PH + 0.5
*PL + 0.5
*0.6
UNIT
ns
ns
ns
ns
CLKOUT1
1
4
2
3
4
Figure 9. CLKOUT1 Timings
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