AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change
Page 27
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Table 4-E Switching Characteristics Over Recommended Operating Conditions for Serial Port
Receive
3.3 Volts
Reference
Parameter
Min
Max
Units
t
d(DX)
Delay time, DX valid after CLKX rising (Passive
Mode)
25
ns
t
c(SCK)
Cycle time, serial port clock
6H
ns
t
f(SCK)
Fall time, serial port clock
6
ns
t
r(SCK)
Rise time, serial port clock
6
ns
t
w(SCK)
Pulse duration, serial port clock low/ high
3H
ns
t
su(FSR)
Setup time, FSR before CLKR falling edge
6
ns
t
su(DR)
Setup time, DR before CLKR falling edge
6
ns
t
d(FSX)
Delay time, CLKX rising to FSX
15
ns
t
d(DX)
Delay time, CLKX rising to DX (Active Mode)
15
ns
t
h(FSX)
Hold time, FSX after CLKX falling edge
6
ns
t
h(FSX)H
Hold time, FSX after CLKX rising edge
2H-5
ns
t
dis(DX)
Disable time, CLKX rising to DX
20
ns
t
h(DX)
Hold time, DX valid after CLKX rising edge
-5
ns
•
Note: H = 7.629 ns; however, do not operate serial clocks any faster than 2.048 MHz. Thus t
c(SCK)
should be a minimum of
488.3 nsec.
