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Specification
NET2272 USB Peripheral Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 1.2, October 15, 2003
101
10.4.14
Local Bus DMA Write; Burst Mode
Operating Conditions: VDDC: 2.2-2.6V, VDDIO: 3.2-3.5V, TA = 0°C to 70°C, Output Load = 25pF
NAME
DESCRIPTION
MIN
TYP
MAX
UNIT
T20
Write enable true to DREQ false
4
20
ns
T26
Write enable width (1)
5
ns
T27
Data setup to end of write enable
5
ns
T28
Data hold time from end of write enable
0
ns
T29
Width of EOT# pulse (3)
5
ns
T30
DMA Write Recovery
28
ns
(1) For non-split DMA mode, write enable is the occurrence of DACK# and optionally, IOW#. For split DMA
mode, write enable is the occurrence of DACK# and optionally, DMAWR#.
(3) EOT#, DACK#, and optionally, IOW# or DMAWR# must all be true for at least T29 for proper recognition of
the EOT# pulse.
T20
T27
T26
T30
T26
T27
T30
T27
T26
T28
T28
T28
T29
D0
D2
D1
0ns
25ns
50ns
75ns
100ns
125ns
DREQ
DACK#
IOW# (Optional)
LD[15:0]
EOT# (Optional)
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