AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 97

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Function Interface Unit (UFI)
4202D–SCR–06/05
DPLL
SIE
Figure 50. SIE Block Diagram
The Function Interface Unit provides the interface between the AT8xC5122D (or
AT83C5123) and the SIE. It manages transactions at the packet level with minimal inter-
vention from the device firmware, which reads and writes the endpoint FIFOs.
Figure 51. UFI Block Diagram
D+
D-
UFI
DPR Control
USB side
Transfer
Control
FSM
End of Packet
Detection
Start of Packet
Detection
Clk48
(48 MHz)
Clock
Recovery
Asynchronous Information
Transfer
User DPRAM
USB Pattern Generator
Parallel to Serial Converter
Bit Stuffing
NRZI Converter
CRC16 Generator
NRZI ‘ NRZ
Bit Unstuffing
Packet bit counter
Endpoint 6
Endpoint 5
Endpoint 4
Endpoint 3
Endpoint 2
Endpoint 1
Endpoint 0
SysClk
(12 MHz)
CSREG 0 to 7
DPR Control
mP side
Registers
Bank
8
SYNC detection
Address Decoder
Serial to Parallel
Conversion
CRC5 & CRC16
Generation/Check
PID decoder
DataIn [7:0]
C51
Microcontroller
Interface
Up to 48 MHz
UC_SYSCLK
DataOut
8
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