User`s manual

AMBE-2000™ Vocoder Chip
User’s Manual Version 4.9
DVSI Confidential Proprietary, Subject to Change Page 26
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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(SCK)
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.