adsp-bf548 Analog Devices, Inc., adsp-bf548 Datasheet - Page 45

• Manufacturer Part Number: adsp-bf548
• Description: Blackfin Embedded Processor
• Manufacturer: Analog Devices, Inc.

Table 27. Asynchronous Memory Write Cycle Timing with Asynchronous ARDY
1
2
Parameter
Timing Requirements
t
t
Switching Characteristics
t
t
t
t
S = number of programmed setup cycles, WA = number of programmed write access cycles.
Output pins include AMS3–0, ABE1–0, ADDR19–1, AOE, AWE.
DANW
HAA
DDAT
ENDAT
DO
HO
CLKOUT
AMSx
ABE1–0
ADDR19–1
AWE
ARDY
DATA15–0
ARDY Negated Delay from AMSx Asserted
ARDY Asserted Hold After ARE Negated
DATA15–0 Disable After CLKOUT
DATA15–0 Enable After CLKOUT
Output Delay After CLKOUT
Output Hold After CLKOUT
ADSP-BF542/ADSP-BF544/ADSP-BF547/ADSP-BF548/ADSP-BF549
2 CYCLES
t ENDAT
SETUP
t DANW
t DO
t DO
Figure 15. Asynchronous Memory Write Cycle Timing with Asynchronous ARDY
WRITE DATA
PROGRAMMED WRITE
ACCESS 2 CYCLES
BE, ADDRESS
2
2
Rev. A | Page 45 of 88 | October 2008
1
EXTENDED
ACCESS
t HO
1 CYCLE
HOLD
t HAA
t DDAT
t HO
Min
0.0
0.0
0.3
Max
(S + WA – 2) × t
6.0
6.0
SCLK
Unit
ns
ns
ns
ns
ns
ns