HOST INTERFACE 
 
 
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Figure 11.  Asynchronous Non-Multiplexed Address 32-bit Read Timing 
Figure 11 Notes:  
1.  When nSELECT is asserted (low), the Total-AceXtreme® is selected for this 
data transfer.  nSELECT must be asserted through the full transfer cycle. In 
Asynchronous mode, nSELECT may be kept low for consecutive transactions 
by the Total-AceXtreme. 
2.  The CPU_WORD_EN[1:0] inputs are used to specify which 16-bit data 
memory words are valid for this transfer. If either or both these bits is ‘0’, then 
the corresponding 16-bit word(s) will return a value of ‘0000’. These inputs 
should be tied high if unused.   
3.  For register accesses, the value of CPU_WORD_EN[1:0] must be ‘11’. 
 
nDATA
_RDY
CPU_
DATA
CPU_WORD_EN[1:0]
RD_nWR
MEM_nREG
CPU_ADDR
nDATA_STRB
nSELECT
tRDD
tOHZ
tOH
tSHtSS
tWait
tAS
tAS
tAS
tAS
Address
tAH
tAH
tAH
tAH
tDD
Data