Siemens S50037 manual PCM Timing

SieMo S50037 Data Book PRELIMINARILY

PCM Timing

Symbol	Parameter	Min	Typ	Max	Unit
fCLK	PCM clock frequency		256		kHz
(1)	Clock duty cycle		50		%
tsy:hd	Hold time from CLK low to SYNC high		1.95		us
tsy:su	Set-up time for SYNC high to CLK low		1.95		us
tsdat:dt	Delay time from CLK to valid MSB data			50	ns
tdat:dt	Delay time from CLK high to PCM_OUT			50	ns
	valid data
tfdat:dt	Delay time from SYNC or CLK, whichever			3009	ns
	is later, to PCM_OUT data line high
	impedance
tsy:low	Hold time from 2nd CLK to SYNC low			3001	ns
tdr:su	Set-up time for PCM_IN valid to CLK low	3001			ns
tdr:hd	Hold time for CLK low to PCM_IN invalid	3001			ns

figure 12 PCM Master Timing

9Assumes normal system clock operation. Figures may vary during low power modes when system clock speeds are reduced.

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