Motorola TMS320C6711D warranty Asynchronous Memory Timing, See −Figure, Are, Awe

SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

ASYNCHRONOUS MEMORY TIMING

timing requirements for asynchronous memory cycles†‡§							(see Figure 27−Figure 28)
								GDPA-167
								ZDPA−167
NO.								−200		UNIT
								−250
								MIN	MAX
3	tsu(EDV-AREH)	Setup time, EDx valid before				high		6.5		ns
				ARE
4	th(AREH-EDV)	Hold time, EDx valid after			high			1		ns
			ARE
6	tsu(ARDY-EKOH)	Setup time, ARDY valid before ECLKOUT high						3		ns
7	th(EKOH-ARDY)	Hold time, ARDY valid after ECLKOUT high						2.3		ns

†To ensure data setup time, simply program the strobe width wide enough. ARDY is internally synchronized. The ARDY signal is recognized in the cycle for which the setup and hold time is met. To use ARDY as an asynchronous input, the pulse width of the ARDY signal should be wide enough (e.g., pulse width = 2E) to ensure setup and hold time is met.

‡RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold. These parameters are programmed via the EMIF CE space control registers.

§ E = ECLKOUT period in ns

switching characteristics over recommended operating conditions for asynchronous memory cycles†‡§ (see Figure 27–Figure 28)

									GDPA-167
									ZDPA−167
NO.			PARAMETER						−200		UNIT
									−250
									MIN	MAX
1	tosu(SELV-AREL)	Output setup time, select signals valid to						low	RS*E − 1.7		ns
							ARE
2	toh(AREH-SELIV)	Output hold time,		high to select signals invalid					RH*E − 1.7		ns
			ARE
5	td(EKOH-AREV)	Delay time, ECLKOUT high to				valid			1.5	7	ns
					ARE
8	tosu(SELV-AWEL)	Output setup time, select signals valid to						low	WS*E − 1.7		ns
							AWE
9	toh(AWEH-SELIV)	Output hold time,		high to select signals and EDx invalid					WH*E − 1.7		ns
			AWE
10	td(EKOH-AWEV)	Delay time, ECLKOUT high to				valid			1.5	7	ns
					AWE
									(WS−1)*E −
11	tosu(EDV-AWEL)	Output setup time, ED valid to AWE low									ns
									1.7

†RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold. These parameters are programmed via the EMIF CE space control registers.

‡ E = ECLKOUT period in ns

§ Select signals include: CEx, BE[3:0], EA[21:2], and AOE.

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