USBN9602-28M National Semiconductor, USBN9602-28M Datasheet - Page 8

• Manufacturer Part Number: USBN9602-28M
• Manufacturer: National Semiconductor

Specifications of USBN9602-28M

• Operating Supply Voltage (typ): 3.3V
• Package Type: SOIC W
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / Rohs Status: Not Compliant

5.0 Pin Descriptions
5.0.4 Microprocessor Interface
24:25
Pin #
10
11
12
13
14
15
6
5
4
1
2
3
7
8
9
Dir
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
I
I
I
I
I
I
MODE[1:0] Interface Mode select input pins. Each of these pins should be hard-wired to Vcc or GND
DACK
Label
INTR
DRQ
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
WR
RD
SO
CS
SK
A0
D0
D1
D2
D3
D4
D5
D6
D7
SI
(Continued)
to select the interface mode:
MODE[1:0] = 00: Mode 0: non-multiplexed parallel interface mode
MODE[1:0] = 01: Mode 1: multiplexed parallel interface mode
MODE[1:0] = 10: Mode 2: MICROWIRE interface mode
MODE[1:0] = 11: Mode 3: reserved†
†Note: Mode 3 also selects the MICROWIRE interface mode in the USBN9602, but this
mode should be reserved to preserve compatibility with future devices.
Active-low DMA Acknowledge. This pin is only used if DMA is enabled. If DMA is not used,
this pin must be tied to Vcc.
DMA Request. This pin is only used if DMA is enabled.
Interrupt Output. The interrupt signal modes (active high, active low or open drain) can be
programmed via the Main Control Register. During Reset, this pin is placed in the TRI-
STATE mode.
Active-low chip select signal.
Active-low read signal for parallel interface.
Mode 0,1: Active-low write signal for parallel interface.
Mode 2: MICROWIRE shift clock
Mode 0 address bus line A0 for parallel interface.
Mode 1 Address Latch Enable for parallel interface.
Mode 2 MICROWIRE Serial Input
Mode 0 Data bus line D0
Mode 1 Address/Data bus line AD0
Mode 2 MICROWIRE Serial Output
Mode 0 Data bus line D1
Mode 1 Address/Data bus line AD1
Mode 0 Data bus line D2
Mode 1 Address/Data bus line AD2
Mode 0 Data bus line D3
Mode 1 Address/Data bus line AD3
Mode 0 Data bus line D4
Mode 1 Address/Data bus line AD4
Mode 0 Data bus line D5
Mode 1 Address/Data bus line AD5
Mode 0 Data bus line D6
Mode 1 Address/Data bus line AD6
Mode 0 Data bus line D7
Mode 1 Address/Data bus line AD7
8
Pin Functional Description
www.national.com