adsp-bf548 Analog Devices, Inc., adsp-bf548 Datasheet - Page 49

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

Table 31. External Port Bus Request and Grant Cycle Timing with Asynchronous BR
Parameter
Timing Requirements
t
Switching Characteristics
t
t
t
t
t
t
WBR
SD
SE
DBG
EBG
DBH
EBH
BR Pulsewidth
CLKOUT Low to AMSx, Address, and AREAWE Disable
CLKOUT Low to AMSx, Address, and ARE/AWE Enable
CLKOUT Low to BG Asserted Output Delay
CLKOUT Low to BG Deasserted Output Hold
CLKOUT Low to BGH Asserted Output Delay
CLKOUT Low to BGH Deasserted Output Hold
CLKOUT
ADDR19-1
BGH
BR
AMSx
ABE1-0
AWE
ARE
BG
ADSP-BF542/ADSP-BF544/ADSP-BF547/ADSP-BF548/ADSP-BF549
Figure 19. External Port Bus Request and Grant Cycle Timing with Asynchronous BR
Rev. A | Page 49 of 88 | October 2008
t
WBR
t
t
t
SD
SD
SD
t
t
DBG
DBH
Min
2 x t
SCLK
t
t
t
t
SE
SE
t
SE
EBG
EBH
Max
5.0
5.0
4.0
4.0
3.6
3.6
Unit
ns
ns
ns
ns
ns
ns
ns