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
23
4.5.3 Non-Multiplexed I/O Write
Non-multiplexed I/O writes are started when both CS# and IOW# are asserted. The address and write data must
meet the setup time with respect to the end of the write transaction. Data is written into the register or packet buffer
when either CS# or IOW# are negated. A new I/O write transaction cannot be started until the T15A recovery time
has expired, and a new I/O read transaction cannot be started until the T15B recovery time has expired. ALE must
be held low for non-multiplexed mode.
A0
NetChip Technology; NET2272; Non-Multiplexed I/O Write; 8/19/02; IOWR.TD
A1
D0
D1
0ns
10ns
20ns
30ns
40ns
50ns
LA[4:0]
LD[15:0]
CS#
IOW#
4.5.4 Multiplexed I/O Write
Multiplexed I/O writes are started when the address is driven onto the lower bits of the data bus, and ALE is pulsed.
Once the address has been latched into the NET2272, the data phase is initiated with the assertion of both CS# and
IOW#. The write data must meet the setup time with respect to the end of the write cycle. Data is written into the
register or packet buffer when either CS# or IOW# are negated. A new I/O write transaction cannot be started until
the T15A recovery time has expired, and a new I/O read transaction cannot be started until the T15B recovery time
has expired.
NetChip Technology; NET2272; Multiplexed I/O Write; 8/19/02; IOWR_MPX.TD
D0
D1
A0
A1
0ns
10ns
20ns
30ns
40ns
50ns
60n
ALE
LD[15:0]
CS#
IOW#
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