NET2272 Datasheet, PDF (97/102 Pages) List of Unclassifed Manufacturers – USB 2.0 Peripheral Controller

Specification
NET2272 USB Peripheral Controller
10.4.10
Local Bus DMA Read; Fast Mode
Operating Conditions: V_DDC: 2.2-2.6V, V_DDIO: 3.2-3.5V, T_A = 0°C to 70°C, Output Load = 25pF
NAME
T20
T21
T22
T23
T24
T25
DESCRIPTION
Read enable true to DREQ false (2)
Read enable false to DREQ true
Data access time from read enable (1)
Data tri-state time from end of read enable
Width of EOT# pulse (3)
DREQ false to DREQ true
MIN
4
4
2
10
15
TYP
35
35
MAX
19
45
16
12
UNIT
ns
ns
ns
ns
ns
ns
(1) For non-split DMA mode, read enable is the occurrence of DACK# and optionally, IOR#. For split DMA mode,
read enable is the occurrence of DACK# and optionally, DMARD#.
(2) The minimum value is only guaranteed if the DMA Request Enable bit in the DMAREQ register is set.
(3) EOT#, DACK#, and optionally, IOR# or DMARD# must all be true for at least T24 for proper recognition of the
EOT# pulse.
(4) A recovery time of 2 nsec is required between the de-assertion of DMA read enable and the assertion of an I/O
read enable.
0ns
DREQ
DACK#
IOR# (Optional)
LD[15:0]
EOT# (Optional)
50ns
100ns
T25
T20
T21
T22
T23
D0
150ns
T20
200ns
T22
T23
D1
T24
______________________________________________________________________________ 97
 NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL [phone] FAX [phone]
http://www.netchip.com
Rev 1.2, October 15, 2003