Yamaha YMF744B (DS-1S) specifications AC’97 Master Clock, Master Clock timing for AC’97

YMF744B

4-4. AC’97 Master Clock	(Fig.5)
Item		Symbol	Min.	Typ.	Max.	Unit
CMCLK Cycle Time		tCMCYC	-	40.69	-	ns
CMCLK High Time		tCMHIGH	8	-	-	ns
CMCLK Low Time		tCMLOW	8		-	ns
CMCLK Rising Time		tCMR	-	4.6	-	ns
CMCLK Falling Time		tCMF	-	2.1	-	ns

Note : Top = 0-70°C, PVDD=3.3 ±0.3 V, VDD=3.3±0.3 V, CVDD=3.3±0.3 V, LVDD=3.3±0.3 V, CL=50 pF

t CMR	t CMF
	0.8 VDD3
CMCLK	0.5 VDD3
	0.2 VDD3

t CMHIGH t CMLOW

t CMCYC

Fig.5: Master Clock timing for AC’97

February 3, 1999

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