USBN9603 National Semiconductor, USBN9603 Datasheet - Page 57

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

8.0 Device Characteristics
8.6 DMA SUPPORT TIMING
.
.
(3.0V< V
Symbol
CC
t
t
t
t
t
t
RHAL
ALWL
t
t
1. If DMA transfer is not interrupted by read or write. If the transfer is interrupted, two additional
ALRL
DWR
t
WRL
DRR
RRL
WW
RW
< 5.5V, 0˚C < TA< +70˚C, unless otherwise specified)
MCLK cycles are used.
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 28. DMA Write to USBN9603
Figure 29. DMA Read to USBN9603
1
1
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
1/CKI
1/CKI
Min
t
WW
0
0
0
t
Input
RW
Output
t
WRL
Typ
t
RRL
t
DWR
t
DRR
2/MCLK
2/MCLK
2/MCLK
2/MCLK
Max
Units
nS
nS
nS
nS
nS
nS
nS
nS
nS
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