net2890 ETC-unknow, net2890 Datasheet - Page 14

• Manufacturer Part Number: net2890
• Description: Interface Controller
• Manufacturer: ETC-unknow

Specification
3. Pin Description
Pin Type
I
O
I/O
S
TS
TP
OD
PD
PU
#
NOTE: Input pins that do not have an internal pull-up or pull-down resistor (designated by PU or PD in the
”Type” column below) must be driven externally when the NET2890 is in the suspended state.
Signal Name
CLKIN
CLKOUT
RESET#
DP,DM
D[7:0]
A[4:0]
CS#
IOR#
____________________________________________________________________________________
Description
Input
Output
Bi-Directional
Schmitt Trigger
Tri-State
Totem-Pole
Open-Drain
50K Pull-Down
50K Pull-Up
Active low
42-38
5-11,
Pin
3,4
44
45
35
14
15
17
335 Pioneer Way, Mountain View, California 94041
I/O, 12mA,
I, S, PU
TEL [phone] FAX [phone]
Type
I, PU
I, PU
I/O
TS
O
I
I
NetChip Technology, Inc., 1999
Rev 2.0, Draft 9, July 16, 1999
http://www.netchip.com
48 MHz Oscillator input. Connect to 48 MHz crystal.
48 MHz Oscillator output. Connect to 48 MHz crystal. The oscillator
stops when the device is suspended by the USB Host.
Reset. External reset. Connect to local or power-on reset. To reset
when oscillator is stopped (initial power-up or in suspend state), assert
for at least two ms. When oscillator is running, assert for at least five
48-MHz clock periods.
USB Data Port
DP and DM are the differential data signals of the USB data port
NOTE: An external 1.5 K
3.3V. This pull-up resistor indicates to the host or upstream hub that a
full-speed device is connected to the USB.
Data Bus. The bi-directional 8-bit data bus is used by devices on the
local bus to read or write registers or FIFOs in the NET2890. D7 is the
most-significant bit.
Address Bus. The local address bus is used by devices on the local
bus to select registers within the NET2890. A4 is the most-significant
bit.
Chip Select. The chip select is used by devices on the local bus to
enable access to registers within the NET2890. This signal is ignored
if DACK# is asserted.
I/O Read. The I/O read strobe is asserted along with CS# and A[4:0]
when a device on the local bus reads from an internal register or FIFO.
It also allows a FIFO to be read during DMA transfers when DACK#
is asserted.
NET2890 USB Interface Controller
Description
resistor must be connected from DP to
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