參數(shù)資料
型號: ADSP-21160M
廠商: Analog Devices, Inc.
元件分類: 數(shù)字信號處理
英文描述: DSP Microcomputer
中文描述: DSP微機
文件頁數(shù): 19/53頁
文件大?。?/td> 696K
代理商: ADSP-21160M
19
REV. 0
ADSP-21160M
Memory Read—Bus Master
Use these specifications for asynchronous interfacing to
memories (and memory-mapped peripherals) without
reference to CLKIN. These specifications apply when the
ADSP-21160M is the bus master accessing external
memory space in asynchronous access mode. Note that
timing for ACK, DATA, RDx, WRx, and DMAG strobe
timing parameters only applies to asynchronous access
mode.
Table 9. Memory Read—Bus Master
Parameter
Timing Requirements:
t
DAD
Min
Max
Unit
Address, CIF, Selects Delay to Data
Valid
1,2
RDx Low to Data Valid
1,3
Data Hold from Address, Selects
4
Data Setup to RDx High
1
Data Hold from RDx High
3,4
ACK Delay from Address, Selects
2,5
ACK Delay from RDx Low
3,5
ACK Setup to CLKIN
3,5
ACK Hold After CLKIN
3
Switching Characteristics:
t
DRHA
Address, CIF, Selects Hold After RDx
High
3
t
DARL
Address, CIF, Selects to RDx Low
2
t
RW
RDx Pulse width
3
t
RWR
RDx High to WRx, RDx, DMAGx Low
3
W = (number of wait states specified in WAIT register) t
CK
.
HI = t
CK
(if an address hold cycle or bus idle cycle occurs, as specified in WAIT register; otherwise HI = 0).
H = t
CK
(if an address hold cycle occurs as specified in WAIT register; otherwise H = 0).
t
CK
0.25t
CCLK
11+W
ns
t
DRLD
t
HDA
t
SDS
t
HDRH
t
DAAK
t
DSAK
t
SAKC
t
HAKC
0.75t
CK
11+W
ns
ns
ns
ns
ns
ns
ns
ns
0
8
1
t
CK
0.5t
CCLK
12+W
t
CK
0.75t
CCLK
11+W
0.5t
CCLK
+3
1
0.25t
CCLK
1+H
ns
0.25t
CCLK
3
t
CK
0.5t
CCLK
1+W
0.5t
CCLK
1+HI
ns
ns
ns
1
Data Delay/Setup: User must meet t
, t
, or t
SDS.
2
The falling edge of MSx, BMS is referenced.
3
Note that timing for ACK, DATA, RDx, WRx, and DMAG strobe timing parameters only applies to asynchronous access mode.
4
Data Hold: User must meet t
HDA
or t
HDRH
in asynchronous access mode. See
Example System Hold Time Calculation on page 44
for the calculation of
hold times given capacitive and dc loads.
5
ACK Delay/Setup: User must meet t
DAAK
, t
DSAK
, or t
SAKC
for deassertion of ACK (Low), all three specifications must be met for assertion of ACK (High).
Figure 15. Memory Read—Bus Master
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