AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 155

• 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

8.6.1 Fast Writes
Fast writes are illustrated in Figure 8-8. When the fast mode is enabled, the DPTR points
to an isochronous OUT FIFO register, and the 8051 executes the “movx a,@dptr” instruc-
tion, the EZ-USB core broadcasts the data from the isochronous FIFO to the outside world
via the data bus D[7..0], and generates a Write Strobe FWR# (Fast Write). A choice of
eight waveforms is available for the write strobe, as shown in the next section.
Page 8-10
Fast Bulk Transfers
The EZ-USB core provides a special auto-incrementing data pointer that makes the fast
transfer mechanism available for bulk transfers. The 8051 loads a 16-bit RAM address
into the AUTOPTRH/L registers, and then accesses RAM data as a FIFO using the
AUTODATA register. Section 6.16, "The Autopointer" describes this special pointer and
register.
DPTR
Figure 8-8. Fast Transfer, EZ-USB to Outside Memory
Chapter 8. EZ-USB CPU
ISO OUT FIFO
Accumulator
FWR#
D[7..0]
External FIFO
or ASIC
EZ-USB TRM v1.9