HOST INTERFACE
Data Device Corporation DS-BU-67301B-G
www.ddc-web.com
1/14
Figure 27. Synchronous, Non-Multiplexed Address 16-bit - Single-Word Register Read
Timing
Figure 27 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 , and
de-asserted high at the end of the transfer.
2. For 16-bit accesses, CPU_WORD_EN[1:0] must be ‘11’ through the full
transfer cycle.
3. For a register read access, CPU_nSTOP asserts (low) simultaneous with
nDATA_RDY, and de-asserts (high) on the host clock cycle following
nSELECT returning high.
CPU_nLAST
nDATA_RDY
nSELECT
CPU
_
ADDR
nDATA_STRB
CPU_
DATA
HOST_
CLK
CPU
_
nSTOP
RD
_nWR
CPU_WORD_EN[1:0]
MEM
_
nREG
MSW_
nLSW
tDD
tCLK
Data A
tWait
tWait
Data B
tRDD
tRDD tRDD tRDD
tOHZ
tOH
tOHZ
tOH
tDD
tSS
tCS
tSS
tCS
tCH tCH
tSHtSH
tSTPD tSTPD tSTPD tSTPD
Address
tAS
tAS
tAS
tAS
tAS
tAS
tAH
tAH
tAH
tAH
tSHC