AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 59

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

Function Interface Unit (UFI)
Figure 32. UFI Block Diagram
4202B–SCR–07/03
DPLL
SIE
UFI
Figure 31. SIE Block Diagram
The Function Interface Unit provides the interface between the AT8xC5122 (or
AT8xC5123) 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.
DPR Control
USB side
D+
D-
Transfer
Control
FSM
Asynchronous Information
Transfer
User DPRAM
End of Packet
Detection
Start of Packet
Detection
Endpoint 6
Endpoint 5
Endpoint 4
Endpoint 3
Endpoint 2
Endpoint 1
Endpoint 0
Clk48
(48 MHz)
Clock
Recovery
USB Pattern Generator
Parallel to Serial Converter
Bit Stuffing
NRZI Converter
CRC16 Generator
NRZI ‘ NRZ
Bit Unstuffing
Packet bit counter
CSREG 0 to 7
DPR Control
mP side
Registers
Bank
SysClk
(12 MHz)
8
C51
Microcontroller
Interface
Up to 48 MHz
UC_SYSCLK
SYNC detection
CRC5 & CRC16
Generation/Check
Address Decoder
Serial t o Parallel
Conversion
PID decoder
AT8xC5122/23
DataIn [7:0]
DataOut
8
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