Cirrus-logic CS49DV8C Manuel d'utilisateur télécharger pdf (Page 22)

22 Copyright 2008 Cirrus Logic, Inc. DS868PP2

CS49DV8C Data Sheet

32-bit Audio DSP Family

5.16 Switching Characteristics — SDRAM Interface

Refer to Figure 11 through Figure 14.

(SD_CLKOUT = SD_CLKIN)

Parameter Symbol Min Typical Max Unit

SD_CLKIN high time t

sdclkh

2.3 - ns

SD_CLKIN low time t

sdclkl

2.3 - ns

SD_CLKOUT rise/fall time t

sdclkrf

-1ns

SD_CLKOUT Frequency 150 MHz

SD_CLKOUT duty cycle - 45 55 %

SD_CLKOUT rising edge to signal valid t

sdcmdv

-3.8ns

Signal hold from SD_CLKOUT rising edge t

sdcmdh

1.1 - ns

SD_CLKOUT rising edge to SD_DQMn valid t

sddqv

-3.8-ns

SD_DQMn hold from SD_CLKOUT rising edge t

sddqh

1.38 - ns

SD_DATA valid setup to SD_CLKIN rising edge t

sddsu

1.3 - ns

SD_DATA valid hold to SD_CLKIN rising edge t

sddh

1.38 - ns

SD_CLKOUT rising edge to ADDRn valid t

sdav

-3.8-ns

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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