AC4830xC-C Data Book
Chapter 3. Chip Data and Timing
Revision 1.0
35
March 2000
3.3 Timing Characteristics
In all figures and tables in this section, the CLKOUT signal is d erived d irectly from
F(CLKOUT) = 100 MHz, or when connected to a codec, F(CLKOUT) = 98.304 MHz.
Note:
In the following Tables and Figures, Timing is over Recommended
Operating Conditions unless otherwise noted.
3.3.1 Memory and I/O Interface Timing
3.3.1.1 Memory Read
Table
3-4: Memory Read Timing Requirements
Parameter (units ns)
Min
Max
(11) Delay time, address valid from CLKOUT low
-2*
3
(17) Delay time, MS- low from CLKOUT low
-1
3
(19) Delay time, MS- high from CLKOUT low
-1
3
(12) Hold time, address valid after CLKOUT low
-2
3
(13) Access time, read data access from address valid
3
u
(18) Access time, read data access from MS- low
2
u
(14) Setup time, read data before CLKOUT low
6
(16) Hold time, read data after CLKOUT low
-2
(15) Hold time, read data after address invalid
0
(20) Hold time, read data after MS- high
0
* Values derived from characterization data and not tested.
u
User selectable
Notes to Table 3-4:
1. t
c
(CI) = 1/ Clock frequency
2. t
c
(CO) = t
c
(CI) /N nsec (where N is the Multiplication Factor = PLLMUL)
3. H = 0.5 t
c
(CO)
Example for a 100 MHz clock
1. t
c
(CI) = 1/ Clock frequency = 1/20 MHz = 50 nsec
2. t
c
(CO) = t
c
(CI) /N nsec (where N is the Multiplication Factor)
so t
c
(CO) = 50 nsec/5 =10 nsec
3. H = 0.5 t
c
(CO) = 5 nsec
Содержание AC4830 C-C Series
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