USBN9603-28M National Semiconductor, USBN9603-28M Datasheet - Page 13

• Manufacturer Part Number: USBN9603-28M
• Description: USB Controller IC
• Manufacturer: National Semiconductor

Specifications of USBN9603-28M

• Interface: USB
• No. Of Pins: 28
• Peak Reflow Compatible (260 C): No
• Supply Voltage Max: 7V
• Leaded Process Compatible: No
• Controller Type, Ic: USB
• Package / Case: 28-WSOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.0 Parallel Interface
The parallel interface allows the USBN9603 to function as a CPU or microcontroller peripheral. Non-multiplexed or multi-
plexed more are selected via the MODE0 and MODE1 pins .
3.1 NON-MULTIPLEXED MODE
Non-multiplexed mode uses the control pins CS, RD, WR, the address pin A0 and the bidirectional data bus D7-0 as shown
in Figure 4. This mode is selected by tying both the MODE1 and MODE0 pins to GND.
The CPU has direct access to the DATA_IN, DATA_OUT and ADDR registers. Reading and writing data to the USBN9603
can be done either in standard access or burst mode. See Figure 5 for timing information.
D7-0
CS
A0
WR
RD
D7-0
WR
CS
RD
A0
Figure 5. Non-Multiplexed Mode Timing Diagram
Write Address
Figure 4. Non-Multiplexed Mode Block Diagram
Input
DATA_IN
DATA_OUT
ADDR
13
Read Data
Out
Data Out
Address
Data In
Burst Read Data
0x3F
0x00
Out
Register File
www.national.com