at43usb370 ATMEL Corporation, at43usb370 Datasheet - Page 2

• Manufacturer Part Number: at43usb370
• Description: Usb 2.0 Full-speed Host/function Processor
• Manufacturer: ATMEL Corporation

Pin
Configuration
Figure 1. AT43USB370 100-Lead TQFP
2
AT43USB370
INTR_OUT
DREQ_N
SELECT
INTR_IN
WAIT_N
READY
VDD18
MORE
PROG
DONE
WE_N
OE_N
BUSY
CS_N
VDD
VSS
VSS
A7
A6
A5
A4
A3
A2
A1
A0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
The AT43USB370 communicates with the external system processor through its generic
32-bit system processor interface. This system interface features 2 Kbytes of FIFO and a DMA
engine designed to ensure maximum bus utilization. The automatic USB retry mechanism built
into the AT43USB370 further minimizes data traffic across the system interface.
As a function, the AT43USB370 operates in full speed mode. It supports one control endpoint
and a maximum of six programmable (max packet size and endpoint type) endpoints. The
internal USB controller runs the function firmware that manages USB enumeration and data
flow control without system processor intervention.
Developing application specific USB device drivers requires the use of a small set of high
level, ANSI C compliant APIs (system interface APIs) that provides communication between
the system processor and the AT43USB370. The encapsulation of USB operations into this
small set of APIs leads to unprecedented ease in device driver development and RTOS
support.
The AT43USB370, with its highly integrated USB hardware/firmware architecture, not only
hides the complexity of the traditional USB design, but also frees system resources from being
burdened by timing critical USB activities. It is an ideal solution for point-to-point USB connec-
tivity in the resource constrained embedded environment.
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
VSS
D20
D21
D22
D23
VDD
D24
D25
D26
D27
VSS
D28
D29
D30
D31
VDD18
VSS
NC
NC
SCAN_EN
RCV_DATA
DCLK
TRST_N
VSS
VDD
3340BS–USB–4/14/03