AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 138

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

The 8051 handles Set_Descriptor requests by clearing the HSNAK bit (by writing “1” to
it), then reading descriptor data directly from the OUT0BUF buffer. The EZ-USB core
keeps track of the number of byes transferred from the host into OUT0BUF, and compares
this number with the length field in bytes 6 and 7. When the proper number of bytes has
been transferred, the EZ-USB core automatically responds to the status phase, which is the
third and final stage of the CONTROL transfer.
EZ-USB TRM v1.9
Note
The 8051 controls the flow of data in the Data Stage of a Control Transfer. After the
8051 processes each OUT packet, it loads any value into the OUT endpoint’s byte count
register to re-arm the endpoint.
Byte
Byte
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
bmRequestType
bRequest
wValueL
wValueH
wIndexL
wIndexH
wLengthL
wLengthH
bmRequestType
bRequest
wValueL
wValueH
wIndexL
wIndexH
wLengthL
wLengthH
Field
Field
Table 7-14. Set Descriptor-Configuration
Table 7-15. Set Descriptor-String
Value
Value
LenL
LenH
LenL
LenH
0x00
0x07
0x00
0x07
0x00
0x02
0x00
0x00
0x00
0x03
0x00
0x00
Chapter 7. EZ-USB CPU
OUT, Device
“Set_Descriptor”
Descriptor Type:
Configuration
IN, Device
“Get_Descriptor”
Config Number
Descriptor Type:
String
(Language ID L)
(Language ID H)
Meaning
Meaning
Read configuration descriptor
data over OUT0BUF
Read string descriptor data over
OUT0BUF
8051 Response
8051 Response
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