adsp-bf548 Analog Devices, Inc., adsp-bf548 Datasheet - Page 44

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

ADSP-BF542/ADSP-BF544/ADSP-BF547/ADSP-BF548/ADSP-BF549
Asynchronous Memory Write Cycle Timing
Table 26
on Page 45
tions for synchronous and for asynchronous ARDY.
Table 26. Asynchronous Memory Write Cycle Timing with Synchronous ARDY
1
Parameter
Timing Requirements
t
t
Switching Characteristics
t
t
t
t
Output pins include AMS3–0, ABE1–0, ADDR19–1, AOE, AWE.
SARDY
HARDY
DDAT
ENDAT
DO
HO
and
describe asynchronous memory write cycle opera-
Table 27 on Page 45
ADDR19–1
CLKOUT
AMSx
ABE1–0
AWE
ARDY
DATA15–0
ARDY Setup Before the Falling Edge of CLKOUT
ARDY Hold After the Falling Edge of CLKOUT
DATA15–0 Disable After CLKOUT
DATA15–0 Enable After CLKOUT
Output Delay After CLKOUT
Output Hold After CLKOUT
2 CYCLES
t ENDAT
SETUP
and
Figure 14. Asynchronous Memory Write Cycle Timing with Synchronous ARDY
t DO
Figure 14
t DO
BE, ADDRESS
WRITE DATA
1
PROGRAMMED
t SARDY
1
2 CYCLES
and
ACCESS
WRITE
Rev. A | Page 44 of 88 | October 2008
Figure 15
t HARDY
EXTENDED
1 CYCLE
ACCESS
t SARDY
t HO
t HARDY
1 CYCLE
HOLD
t DDAT
t HO
Min
5.0
0.0
0.0
0.3
Max
6.0
6.0
Unit
ns
ns
ns
ns
ns
ns