TMS320VC549 datasheet(37/60 Pages) TI

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TMS320VC549

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS078F – SEPTEMBER 1998 – REVISED MAY 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

reset, BIO, interrupt, and MP/MC timings

timing requirements over recommended operating conditions for reset, interrupt, BIO, and MP/MC

[H = 0.5 tc(CO)] (see Figure 15, Figure 16, and Figure 17) (continued)

’549-80

’549-100

’549-120

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

th(RS)

Hold time, RS after CLKOUT low

th(BIO)

Hold time, BIO after CLKOUT low

th(INT)

Hold time, INTn, NMI, after CLKOUT low†

th(MPMC)

Hold time, MP/MC after CLKOUT low

tw(RSL)

Pulse duration, RS low‡§¶

4H+7

4H+5

tw(BIO)S

Pulse duration, BIO low, synchronous

2H+7

2H+5

tw(BIO)A

Pulse duration, BIO low, asynchronous

tw(INTH)S

Pulse duration, INTn, NMI high (synchronous)

2H+7

tw(INTH)A

Pulse duration, INTn, NMI high (asynchronous)

tw(INTL)S

Pulse duration, INTn, NMI low (synchronous)

2H+7

tw(INTL)A

Pulse duration, INTn, NMI low (asynchronous)

tw(INTL)WKP

Pulse duration, INTn, NMI low for IDLE2/IDLE3 wakeup

tsu(RS)

Setup time, RS before X2/CLKIN low§

tsu(BIO)

Setup time, BIO before CLKOUT low

tsu(INT)

Setup time, INTn, NMI, RS before CLKOUT low

tsu(MPMC)

Setup time, MP/MC before CLKOUT low

† The external interrupts (INT0–INT3, NMI) are synchronized to the core CPU by way of a two flip-flop synchronizer which samples these inputs

with consecutive falling edges of CLKOUT. The input to the interrupt pins is required to represent a 1–0–0 sequence at the timing that is

corresponding to three CLKOUTs sampling sequence.

‡ If the PLL mode is selected, then at power-on sequence, or at wakeup from IDLE3, RS must be held low for at least 50

µs to assure synchronization

and lock-in of the PLL.

§ Divide-by-two mode

¶ Note that RS may cause a change in clock frequency, therefore changing the value of H (see the PLL section).

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