USBN9603 National Semiconductor, USBN9603 Datasheet - Page 8

• Manufacturer Part Number: USBN9603
• Description: USBN9603 Universal Serial Bus Full Speed Function Controller with Enhanced DMA Support
• Manufacturer: National Semiconductor

www.national.com
1.0 Signal/Pin Connection and Description
1.2.3
1.2.4
I/O
I/O
I/O
I/O
I/O
I/O
O
O
I
I
I
I
I
I
USB Port
Microprocessor Interface
MODE1-0 Interface Mode. Each of these pins should be hard-wired to V
Name
DACK
Name
D+
D–
INTR
DRQ
AD0
AD1
ALE
WR
CS
RD
SO
SK
D0
D1
A0
SI
USB D+ Upstream Port. This pin requires an external 1.5k pull-up to 3.3V to signal full speed
operation.
USB D– Upstream Port
C1
face mode:
MODE1-0 = 00. Mode 0: Non-multiplexed parallel interface mode
MODE1-0 = 01. Mode 1: Multiplexed parallel interface mode
MODE1-0 = 10. Mode 2: MICROWIRE interface mode
MODE1-0 = 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.
DMA Acknowledge. This active low signal is only used if DMA is enabled. If DMA is not used,
this pin must be tied to V
DMA Request. This pin is used for DMA request only if DMA is enabled.
Interrupt. The interrupt signal modes (active high, active low or open drain) can be config-
ured via the Main Control register. During reset, this signal is TRI-STATE.
Chip Select. Active low chip select
Read. Active low read strobe, parallel interface
Write. Active low write strobe, parallel interface
MICROWIRE Shift Clock. Mode 2
A0 Address Bus Line. Mode 0, parallel interface
Address Latch Enable. Mode 1, parallel interface
MICROWIRE Serial Input. Mode 2
Data Bus Line D0. Mode 0
Address/Data Bus LIne AD0. Mode 1
MICROWIRE Serial Output. Mode 2
Data Bus Line D1. Mode 0
Address/Data Bus Line AD1. Mode 1
C2
Figure 1. Typical Oscillator Circuit
XTAL
CC
.
R2
8
(Continued)
Description
Description
R1
XIN
XOUT
CC
or GND to select the inter-