AS7C331MFT18A
®
Key to switching waveforms
Rising input
Falling input
don’t care
Undefined
Timing waveform of read cycle
tCYC
tCL
tCH
CLK
tADSPS
tADSPH
ADSP
tADSCS
tADSCH
ADSC
LOAD NEW ADDRESS
A3
tAS
tAH
A1
A2
tWH
Address
tWS
GWE, BWE
tCSS
tCSH
CE0, CE2
CE1
tADVS
tADVH
ADV
OE
ADV inserts wait states
tOE
tHZOE
tOH
tLZOE
Q(A3Ý11)
Q(A3Ý10)
Q(A2Ý01)
Q(A2Ý10)
Q(A2Ý11)
Q(A3)
Q(A3Ý01)
Q(A1)
Dout
tCD
tHZC
Read Suspend Read
Burst
Read
Burst
Read
2Ý10
) Q(A
Suspend
Read
Burst
Read
2Ý11
Read
Q(A3)
Burst
Read
3Ý01
Burst
Read
3Ý10
Burst
Read
3Ý11
) Q(A )
Q(A1)
Read
Q(A2)
DSEL
2Ý01
) Q(A
2Ý10
) Q(A
Q(A1)
Q(A
)
Q(A
) Q(A
Note: Ý = XOR when LBO = high/no connect; Ý = ADD when LBO = low. BW[a:d] is don’t care.
1/21/05, v 1.4
Alliance Semiconductor
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