Analog Devices ADSP-21020 manual Address, Select to Data Valid + DT, XRD Low to Data Valid + 5DT/8

ADSP-21020

Memory Read

														K/B/T Grade		K/B/T Grade		B/T Grade		K Grade
														20 MHz		25 MHz		30 MHz		33.3 MHz		Frequency Dependence*
Parameter														Min	Max	Min	Max	Min	Max	Min	Max	Min		Max		Unit
Timing Requirement:
tDAD	Address, Select to Data Valid														37		27		20		17			37	+ DT	ns
tDRLD	xRD	Low to Data Valid													24		18		13		11			24	+ 5DT/8	ns
tHDA	Data Hold from Address, Select													0		0		0		0						ns
tHDRH	Data Hold from			xRD						High				–1		–1		–1		–1						ns
tDAAK	xACK Delay from Address														27		18		12		9			27	+ 7DT/8	ns
tDRAK	xACK Delay from							xRD				Low			15		10		6		5			15	+ DT/2	ns
tSAK	xACK Setup before CLKIN High													14		12		10		9		14	+ DT/4			ns
tHAK	xACK Hold after CLKIN High													0		0		0		0						ns
Switching Characteristic:
tDARL	Address, Select to										Low			8		4		2		0		8 + 3DT/8				ns
							xRD
tDAP	xPAGE Delay from Address, Select														1		1		1		1					ns
tDCKRL	CLKIN High to				xRD					Low				16	26	13	24	12	22	11	21	16	+ DT/4	26 + DT/4		ns
tRW	xRD	Pulse Width												26		20		15		13		26	+ 5DT/8			ns
tRWR	xRD	High to	xRD			,			xWD				Low	17		13		11		9		17	+ 3DT/8			ns

NOTES

*DT = tCK – 50 ns

x = PM or DM; Address = PMA23-0, DMA31-0; Data = PMD47-0, DMD39-0; Select = PMS1-0, DMS3-0.

–18– REV. C