T83C5121XXX-ICSIL datasheet(30/115 Pages) ATMEL

30 / 115 page

A/T8xC5121

4164G–SCR–07/06

Block Diagram

The Smart Card Interface Block diagram is shown in Figure 14.

Figure 14. SCIB Block Diagram

Functional Description

The architecture of the Smart Card Interface Block is detailed below.

Barrel Shifter

It allows the translation between 1 bit serial data and 8 bits parallel data.

The barrel function is useful for character repetition since the character is still present in

the shifter at the end of the character transmission.

This shifter is able to shift the data in both directions and to invert the input or output

value in order to manage both direct and inverse ISO7816-3 convention.

Coupled with the barrel shifter there is a parity checker and generator.

There are 2 registers connected to this barrel shifter, one for the transmission and one

for the reception.

They act as buffers to relieve the CPU of timing constraints.

SCART FSM

(Smart Card Asynchronous Receiver Transmitter Finite State Machine)

This is the core of the design. Its purpose is to control the barrel shifter. To sequence

correctly the barrel shifter for a reception or a transmission, it uses the signals issued by

Barrel shifter

SCI Registers

Scart

fsm

Interrupt generator

Power on

Power off

fsm

I/O

mux

IO (in)

IO (out)

CLK

RST

C4 (out)

Clk_iso

C8 (out)

CLK1

C4 (in)

C8 (in)

Waiting time

counter

Guard time

counter

Etu counter

VCARD

INT

Clk_cpu

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