AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 147

• Manufacturer Part Number: AN2131SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131SC

• 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: 16
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1306; AN2131SC

IN transfers travel from device to host. Figure 8-2 shows the EZ-USB registers and bits
associated with isochronous IN transfers.
8.2.1 Initialization
To initialize an isochronous IN endpoint, the 8051 performs the following:
Page 8-2
8.2
INISOVAL
IN8ADDR
USBPAIR
•
•
•
•
USBIEN
Sets the endpoint valid bit for the endpoint.
Sets the endpoint’s FIFO size by loading a starting address (Section 8.4, "Setting
Isochronous FIFO Sizes").
Sets the ISOSEND0 bit in the USBPAIR register for the desired response.
Enables the SOF interrupt. All isochronous endpoints are serviced in response to
the SOF interrupt.
Isochronous IN Transfers
A9
15
FIFO Start Address (see text)
7
7
Initialization
Endpoint Valid (1=valid)
Registers Associated with an ISO IN endpoint
A8
14
ISOSEND0 (see text)
6
6
SOFIE (1=enabled)
A7
13
5
5
Figure 8-2. Isochronous IN Endpoint Registers
12
A6 A5
4
4
11
3
3
(EP8IN shown as example)
10
A4
2
2
Chapter 8. EZ-USB CPU
9
0
1
1
8
0
0
0
IN8DATA
USBIRQ
Data transfer
7
7
SOFIR (1=clear request)
6
6
5
5
Data to USB
4
4
3
3
EZ-USB TRM v1.9
2
2
1
1
0
0