AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 64

• Manufacturer Part Number: AT43USB325E-AC
• Description: IC USB KEYBOARD CTRLR HUB 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB325E-AC

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: SRAM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI, 3-Wire Serial
• Number Of I /o: 42
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8.1.1
64
AT43USB325
Control Transfers at Control End-point EP0
The description given below is for the function control end-point, but applies to the hub control
end-point as well if the proper registers are used.
The following illustration describes the three possible types of control transfers – Control Write,
Control Read and No-data control:
The following state diagram shows how the various state transitions are triggered. Additional
decision making may take place within the response states to determine the next expected
state. Unmarked arcs represent transitions that trigger immediately following completion of the
response state processing. Stable states, those requiring an interrupt to exit having no
unmarked arcs as exit paths, are shown in bold.
Control
Write
Control
Read
No-data
Control
SETUP(0)
SETUP(0)
SETUP(0)
Setup
Stage
Setup
Stage
DATA0
DATA0
DATA0
DATA1(0)
OUT(1)
Status
Stage
DATA1
DATA1
IN(1)
IN(1)
OUT(0)
IN(0)
Stage
DATA0
DATA0
Data
DATAn
DATA1(0)
…
…
OUT(0/1)
DATA0/1
DATA0/1
IN(0/1)
Data packet with PID’s
data toggle bit equal to n
Zero length DATA1 packet
Legend:
DATA1(0)
DATA1(0)
Status
OUT(1)
Stage
IN(1)
IN(1)
3355C–USB–4/05