參數(shù)資料
型號(hào): SL811S
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: 總線控制器
英文描述: USB Dual Speed Slave Controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQCC28
封裝: PLASTIC, LCC-28
文件頁(yè)數(shù): 24/27頁(yè)
文件大?。?/td> 181K
代理商: SL811S
SL811S/T
Document #: 38-08009 Rev. **
Page 24 of 27
7.5.3
SL811S DMA Write Cycle
Note:
n
WR
must go low after n
DACK
goes low in order for n
DRQ
to clear. If this sequence is not implemented as requested, the
next n
DRQ
will be not inserted.
Parameter
Description
Min.
Typ.
Max.
tdack
nDACK low
80ns
tdwrlo
nDACK to nWR low delay
5 ns
tdakrq
nDACK low to nDRQ high delay
5 ns
tdwrp
nWR pulse width
65 ns
tdhld
Data hold after nWR high
5 ns
tdsu
Data set-up to nWR strobe low
60 ns
tackrq
NDACK high to nDRQ low
5 ns
tackwrh
NDACK high to nDRQ low
5 ns
twrcycle
DMA Write Cycle Time
150 ns
nDRQ
nDACK
D0-D7
DATA
nWR
tdwrp
tdsu
tdack
tdhld
tdwrlo
tackwrh
tdakrq
tackrq
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