Texas Instruments TMS320C6712D warranty Reset Timing, Timing requirements for reset†‡ see Figure

SPRS293A − OCTOBER 2005 − REVISED NOVEMBER 2005

RESET TIMING

Note: If a configuration pin must be routed out from the device, the internal pullup/pulldown (IPU/IPD) resistor should not be relied upon; TI recommends the use of an external pullup/pulldown resistor.

timing requirements for reset†‡ (see Figure 39)

NO.								−150		UNIT
								MIN	MAX
1	tw(RST)	Pulse duration,						100		ns
			RESET
12	tsu(BOOT)	Setup time, boot configuration bits valid before					high§	2P		ns
					RESET
13	t	Hold time, boot configuration bits valid after				high§		2P		ns
				RESET
	h(BOOT)

†P = 1/CPU clock frequency in ns. For example, when running parts at 150 MHz, use P = 6.7 ns.

‡For this device, the PLL is bypassed immediately after the device comes out of reset. The PLL Controller can be programmed to change the PLL mode in software. For more detailed information on the PLL Controller, see the TMS320C6000 DSP Software-ProgrammablePhase-Lock Loop (PLL) Controller Reference Guide (literature number SPRU233).

§The Boot and device configurations bits are latched asynchronously when RESET is transitioning high. The Boot and device configurations bits consist of: BOOTMODE[1:0] and LENDIAN.

switching characteristics over recommended operating conditions during reset¶ (see Figure 39)

NO.		PARAMETER								−150	UNIT
									MIN	MAX
2	td(RSTH-ZV)	Delay time, external				RESET	high to internal reset	CLKMODE0 = 1		512 x CLKIN	ns
		high and all signal groups valid#								period
3	td(RSTL-ECKOL)	Delay time,	RESET		low to ECLKOUT high impedance				0		ns
4	td(RSTH-ECKOV)	Delay time,			high to ECLKOUT valid					6P	ns
			RESET
5	td(RSTL-CKO2IV)	Delay time,			low to CLKOUT2 high impedance				0		ns
			RESET
6	td(RSTH-CKO2V)	Delay time,			high to CLKOUT2 valid					6P	ns
			RESET
7	td(RSTL-CKO3L)	Delay time,			low to CLKOUT3 low				0		ns
			RESET
8	td(RSTH-CKO3V)	Delay time,			high to CLKOUT3 valid					6P	ns
			RESET
9	td(RSTL-EMIFZHZ)	Delay time,			low to EMIF Z group high impedance				0		ns
			RESET
10	t	Delay time,			low to EMIF low group (BUSREQ) invalid				0		ns
			RESET
	d(RSTL-EMIFLIV)
11	td(RSTL-Z1HZ)	Delay time,		low to Z group high impedance					0		ns
			RESET

¶ P = 1/CPU clock frequency in ns.

Note that while internal reset is asserted low, the CPU clock (SYSCLK1) period is equal to the input clock (CLKIN) period multiplied by 8. For example, if the CLKIN period is 20 ns, then the CPU clock (SYSCLK1) period is 20 ns x 8 = 160 ns. Therefore, P = SYSCLK1 = 160 ns while internal reset is asserted.

#The internal reset is stretched exactly 512 x CLKIN cycles if CLKIN is used (CLKMODE0 = 1). If the input clock (CLKIN) is not stable when RESET is deasserted, the actual delay time may vary.

EMIF Z group consists of: EA[21:2], ED[15:0], CE[3:0], BE[1:0], ARE/SDCAS/SSADS, AWE/SDWE/SSWE, AOE/SDRAS/SSOE and

HOLDA

EMIF low group consists of: BUSREQ

Z group consists of: CLKR0, CLKR1, CLKX0, CLKX1, FSR0, FSR1, FSX0, FSX1, DX0, DX1, TOUT0, and TOUT1.

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