AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 208

• 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

Bit 3:
This bit indicates the isochronous buffer currently in use by the EZ-USB core. It is used
only for diagnostic purposes.
Bits 2,1:
These bits must always be written with zeros.
Bit 0:
ISODISAB=0 enables all 16 isochronous endpoints
ISODISAB=1 disables all 16 isochronous endpoints, making the 2,048 bytes of isochro-
nous FIFO memory available as 8051 data memory at 0x2000-0x27FF.
Bits 0-7:
The 8051 can check these bits as a fast way to check all of the OUT isochronous endpoints
at once for no data received during the previous frame. A “1” in any bit position means
that a zero byte Isochronous OUT packet was received for the indicated endpoint.
EZ-USB TRM v1.9
ISOCTL
ZBCOUT
EP15
b7
b7
R
R
0
x
-
EP14
PPSTAT
MBZ
ISODISAB
EP(n)
b6
b6
R
R
-
0
x
EP13
Figure 12-12. Isochronous Control Register
b5
b5
R
R
0
x
-
Figure 12-13. Zero Byte Count Register
Ping-Pong Status
Must be zero
ISO Endpoints Disable
Zero Byte Count for ISO OUT Endpoints
Chapter 12. EZ-USB Registers
Zero Byte Count Bits
Isochronous Control
EP12
b4
b4
R
R
0
x
-
PPSTAT
EP11
b3
b3
R
R
0
x
MBZ
EP10
R/W
b2
b2
R
0
x
MBZ
EP9
R/W
b1
b1
R
0
x
ISODISAB
Page 12-15
EP8
R/W
b0
b0
R
0
x
7FA1
7FA2