參數(shù)資料
型號(hào): ISP1761
廠商: NXP Semiconductors N.V.
英文描述: Hi-Speed Universal Serial Bus On-The-Go controller
中文描述: 高速通用串行總線和On - The - Go控制器
文件頁數(shù): 143/158頁
文件大?。?/td> 724K
代理商: ISP1761
9397 750 13258
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 12 January 2005
143 of 158
Philips Semiconductors
ISP1761
Hi-Speed USB OTG controller
15.2.2
DMA timing
15.2.2.1
DMA read or write
DREQ is continuously asserted until the last transfer is done or the FIFO is full.
Data strobes: RD_N (read) and WR_N (write).
(1) Programmable polarity: shown as active LOW.
(2) Programmable polarity: shown as active HIGH.
Fig 28. DMA read or write
t
h19
t
w19
t
su19
t
d19
t
su29
t
d29
t
h29
T
cy19
(write) DATA[31:0]
(read) DATA[31:0]
DREQ
(2)
DACK
(1)
RD_N/WR_N
(1)
004aaa528
t
su39
t
w29
t
a19
t
h39
Table 178: DMA read or write
V
CC(I/O)
= 1.65 V to 1.95 V; T
amb
=
40
°
C to +85
°
C; unless otherwise specified.
Symbol
Parameter
T
cy19
read or write cycle time
t
su19
DREQ setup time before first DACK on
t
d19
DREQ on delay after last strobe off
t
h19
DREQ hold time after last strobe on
t
w19
RD_N/WR_N pulse width
t
w29
RD_N/WR_N recovery time
t
d29
read data valid delay after strobe on
t
h29
read data hold time after strobe off
t
h39
write data hold time after strobe off
t
su29
write data setup time before strobe off
t
su39
DACK setup time before RD_N/WR_N assertion
t
a19
DACK deassertion after RD_N/WR_N
deassertion
Min
75
10
33.33
0
40
36
-
-
1
10
0
0
Max
-
-
-
53
600
-
30
5
-
-
-
30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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