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ADSP2185 Datasheet(PDF) 19 Page - Analog Devices

No. de pieza ADSP2185
Descripción Electrónicos  DSP Microcomputer
PDF  32 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADSP2185 Datasheet(HTML) 19 Page - Analog Devices

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ADSP-2185
REV. 0
–19–
Parameter
Min
Max
Unit
Bus Request/Grant
Timing Requirements:
tBH
BR Hold after CLKOUT High1
0.25 tCK + 2
ns
tBS
BR Setup before CLKOUT Low
1
0.25 tCK + 17
ns
Switching Characteristics:
tSD
CLKOUT High to
xMS, RD, WR Disable
0.25 tCK + 10
ns
tSDB
xMS, RD, WR Disable to BG Low
0
ns
tSE
BG High to xMS, RD, WR Enable
0
ns
tSEC
xMS, RD, WR Enable to CLKOUT Hig
0.25 tCK – 7
ns
tSDBH
xMS, RD, WR Disable to BGH Low
2
0ns
tSEH
BGH High to xMS, RD, WR Enable
2
0ns
NOTES
xMS = PMS, DMS, CMS, IOMS, BMS
1BR is an asynchronous signal. If BR meets the setup/hold requirements, it will be recognized during the current clock cycle; otherwise the signal will be recognized on
the following cycle. Refer to the ADSP-2100 Family User’s Manual for
BR/BG cycle relationships.
2BGH is asserted when the bus is granted and the processor requires control of the bus to continue.
CLKOUT
tSD
tSDB
tSE
tSEC
tSDBH
tSEH
BR
tBH
CLKOUT
PMS, DMS
BMS, RD
WR
BG
BGH
tBS
Figure 16. Bus Request–Bus Grant



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