32579BElectrical Specifications

Table 9-40. AC97 Clocks Parameters

Symbol

Parameter

Min

Typ

Max

Unit

Comments

 

 

 

 

 

 

 

FBIT_CLK

BIT_CLK frequency

 

12.288

 

MHz

 

tCLK_PD

BIT_CLK period

 

81.4

 

ns

 

tCLK_J

BIT_CLK output jitter

 

 

750

ps

 

tCLK_H

BIT_CLK high pulse width

32.56

40.7

48.84

ns

Note 1

tCLK_L

BIT_CLK low pulse width

32.56

40.7

48.84

ns

Note 1

FSYNC

SYNC frequency

 

48.0

 

KHz

 

tSYNC_PD

SYNC period

 

20.8

 

µs

 

tSYNC_H

SYNC high pulse width

 

1.3

 

µs

 

tSYNC_L

SYNC low pulse width

 

19.5

 

µs

 

FAC97_CLK

AC97_CLK frequency

 

24.576

 

MHz

 

tAC97_CLK_PD

AC97_CLK period

 

40.7

 

ns

 

tAC97_CLK_D

AC97_CLK duty cycle

45

 

55

%

 

tAC97_CLK_FR

AC97_CLK fall/rise time

2

 

5

ns

 

tAC97_CLK_J

AC97_CLK output edge-to-

 

 

100

ps

Measured from edge to edge

 

edge jitter

 

 

 

 

 

 

 

 

 

 

 

 

Note 1. Worst case duty cycle restricted to 40/60.

tCLK_L

BIT_CLK tCLK_H

tCLK_PD

tSYNC_L

SYNC tSYNC_H

tSYNC_PD

tAC97_CLK_PD

VOHD

AC97_CLK VOLD

tAC97_CLK_FR

Figure 9-50. AC97 Clocks Diagram

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AMD SC1200, SC1201 manual 40. AC97 Clocks Parameters, AC97CLK Vold