ADMC330

–19–

REV. 0

TIMING PARAMETERS

SERIAL PORTS

Frequency

12.5 MHz

13.0 MHz

13.824 MHz*

Dependency

Parameter

Min Max

Min Max

Min

Max

Min

Max

Unit

Timing Requirement:

SCLK Period

80

76.9

72.3

100

ns

DR/TFS/RFS Setup before SCLK Low

8

8

8

15

ns

DR/TFS/RFS Hold after SCLK Low

10

10

10

20

ns

30

28

28

40

ns

Switching Characteristic:

20

35

19.2 34.2

18.1

33.1

SCLK High to DT Enable

0

0

0

0

ns

SCLK High to DT Valid

20

20

20

30

ns

0

0

0

0

ns

20

20

20

30

ns

0

0

0

0

ns

TFS (Alt) to DT Enable

0

0

0

0

ns

TFS (Alt) to DT Valid

18

18

18

25

ns

25

25

25

40

ns

RFS (Multichannel, Frame Delay Zero)

20

20

20

30

ns

to DT Valid

*Maximum serial port operating frequency is 13.824 MHz for all processor speed grades except the 12.5 MHz ADSP-2101 and 13.0 MHz ADSP-2111.

CLKOUT

SCLK

DR

DT

TFS

(ALTERNATE

FRAME MODE)

RFS

(MULTICHANNEL MODE,

FRAME DELAY 0 (MFD = 0))

Figure 14. Serial Ports