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DP83902AVF bảng dữ liệu(PDF) 56 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83902AVF
Giải thích chi tiết về linh kiện  ST-NICTM Serial Network Interface Controller for Twisted Pair
PDF  70 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP83902AVF bảng dữ liệu(HTML) 56 Page - National Semiconductor (TI)

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150 Switching Characteristics AC Specs DP83902A Note All Timing is Preliminary (Continued)
DMA Control Bus Arbitration
TLF11157 – 37
Symbol
Parameter
Min
Max
Units
brqhl
Bus Clock to Bus Request High for Local DMA
50
ns
brqhr
Bus Clock to Bus Request High for Remote DMA
45
ns
brql
Bus Request Low from Bus Clock
60
ns
backs
Acknowledge Setup to Bus Clock (Note 1)
2
ns
bccte
Bus Clock to Control Enable
60
ns
bcctr
Bus Clock to Control Release (Notes 2 3)
70
ns
Note 1
BACK must be setup before T1 after BREQ is asserted Missed setup will slip the beginning of the DMA by four bus clocks The Bus Latency will influence
the allowable FIFO threshold
Note 2
During remote DMA transfers only a single bus transfer is performed During local DMA operations burst mode transfers are performed
Note 3
These limits include the RC delay inherent in our test method These signals typically turn off within 15 ns enabling other devices to drive these lines with
no contention
56



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