AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 239

• 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 EZ-USB core provides a fast transfer mode that improves the8051 transfer speed
between external logic and the isochronous and bulk endpoint buffers. The FASTXFR
register enables the modes for bulk and/or isochronous transfers, and selects the timing
waveforms for the FRD# and FWR# signals.
Bit 7:
The 8051 sets FISO=1 to enable fast isochronous transfers for all16 isochronous endpoint
FIFOs. When FISO=0, fast transfers are disabled for all 16 isochronous endpoints.
Bit 6:
The 8051 sets FBLK=1 to enable fast bulk transfers using the Autopointer (see Section
12.16, "SETUP Data") with BULK endpoints. When FBLK=0 fast transfers are disabled
for BULK endpoints.
Bit 5:
The 8051 sets RPOL=0 for active-low FRD# pulses, and RPOL=1 for active high FRD#
pulses.
Bit 4-3:
These bits select the phasing and width of the FRD# pulse. See Figure 8-12.
Page 12-46
FASTXFR
12.15 Fast Transfers
FISO
R/W
b7
x
FBLK
FISO
FBLK
RPOL
RMOD
R/W
b6
x
RPOL
Figure 12-38. Fast Transfer Control Register
R/W
b5
x
Enable Fast ISO Transfers
Enable Fast BULK Transfers
FRD# Pulse Polarity
FRD# Pulse Mode
Fast Transfer Control
Chapter 12. EZ-USB Registers
RMOD1
R/W
b4
x
RMOD0
R/W
b3
x
WPOL
R/W
b2
x
WMOD1
R/W
b1
x
EZ-USB TRM v1.9
WMOD0
R/W
b0
x
7FE2