AT83C5135_14 Datasheet, PDF (102/166 Pages) ATMEL Corporation – Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply

• Address checking.
• Clock generation (via DPLL).
Figure 21-2. SIE Block Diagram
End of Packet
Detection
Start of Packet
Detection
D+
NRZI ‘NRZ
D-
Bit Un-stuffing
Packet Bit Counter
Clock
Recovery
SysClk
(12 MHz)
Clk48
(48 MHz)
USB Pattern Generator
Parallel to Serial Converter
Bit Stuffing
NRZI Converter
CRC16 Generator
SYNC Detection
PID Decoder
Address Decoder ^DataOut
Serial to
8
Parallel
CRC5 and CRC16
Generation/Check
8
DataIn [7:0]
21.1.2
Function Interface Unit (FIU)
The Function Interface Unit provides the interface between the AT89C5131 and the SIE. It man-
ages transactions at the packet level with minimal intervention from the device firmware, which
reads and writes the endpoint FIFOs.
102 AT83C5134/35/36
7683C–USB–11/07