USBN9604 National Semiconductor, USBN9604 Datasheet - Page 57

• Manufacturer Part Number: USBN9604
• Description: USBN9603/USBN9604 Universal Serial Bus Full Speed Node Controller with Enhanced DMA Support
• Manufacturer: National Semiconductor

8.0 Device Characteristics
8.6 DMA SUPPORT TIMING
.
.
(3.0V< V
Symbol
t
CC
t
t
t
t
t
t
WRL
DWR
RHAL
ALWL
t
DRR
1. The minimum value of this parameter is from the system perspective. This value can be used
2. If DMA transfer is not interrupted by read or write. If the transfer is interrupted, two additional
ALRL
RRL
t
WW
RW
< 5.5V, 0˚C < TA< +70˚C, unless otherwise specified)
as the maximum value from the device perspective.
The maximun value of this parameter is infinity.
MCLK cycles are used.
1
1
1
1
Request High to ACK Low
ACK Low to Write Low
Write Pulse Width
Write High to Request Low C
DMA Write Recovery
ACK low to Read Low
Read Pulse Width
Read High to Request Low C
DMA Read Recovery
DACK
Parameter
DRQ
D7-0
DACK
WR
DRQ
D7-0
RD
(Continued)
Figure 30. DMA Read from USBN9603/4
Figure 29. DMA Write to USBN9603/4
2
2
Conditions
C
C
C
C
C
C
C
L
L
L
L
L
L
L
L
L
t
= 50 pF
= 50 pF
= 50 pF
= 50 pF
= 50 pF
= 50 pF
= 50 pF
= 50 pF
= 50 pF
RHAL
t
t
t
RHAL
ALWL
ALRL
57
2/MCLK
2/MCLK
2/MCLK
2/MCLK
1/CKI
1/CKI
Min
t
WW
0
0
0
t
Input
RW
Output
t
WRL
Typ
t
RRL
t
DWR
t
DRR
Max
Units
nS
nS
nS
nS
nS
nS
nS
nS
nS
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