SEC1210 datasheet(59/218 Pages) MICROCHIP

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 2013 - 2016 Microchip Technology Inc.

DS00001561C-page 59

SEC1110/SEC1210

10.9.2

T=0 INCOMING BYTE FILTER

This state machine is active when a command is being executed that writes data into the card. In spite of this, the bytes

being filtered are only the responses that are coming from the card. When the controller is intending to transmit data,

the state machine is simpler, because there are fewer ways that the Smart Card can respond. The command is executed

in multiple exchanges between the controller and the card, and as far as the controller hardware is concerned, each of

these (starting with transmission of a 5-byte command header from the controller) is an independent exchange. See

Figure 10-8 for an example of an T=0 incoming command sequence.

A state diagram for the Incoming Byte Filter is shown in FIGURE 10-9: on page 61.

FIGURE 10-7:

T=0 OUTGOING BYTE FILTER STATE DIAGRAM

INS (8 bits)

Last Character

Transmitted

(Turnaround)

and

ENABLE == 1

IDLE

COUNT (9 bits)

S/W INPUTS:

ENABLE (1 bit)

Note: COUNT is modified by this state machine.

It is specified by software as an 8-bit value with

hex '00' meaning 256 rather than zero. This

state machine will not be activated for counts of

0; the Incoming Filter will be used instead.

Awaiting Procedure Byte

Collect 1 Data

Collect Multiple

Data

Awaiting SW2

NULL

(INS || ~INS) &&

(COUNT == 0)

WWT

Violation /

WWT Flag;

EOM; Disable

Receiver

(Any Character) &&

(COUNT > 1) /

COUNT--; FIFO

Else /

CV Flag;

EOM;

Disable

Receiver

IDLE

Any Char /

EOM; Disable

Receiver

WWT

Violation /

WWT Flag;

EOM; Disable

Receiver

WWT

Violation /

WWT Flag;

EOM; Disable

Receiver

SW1 &&

(COUNT ==

0) / FIFO

(~INS) &&

(COUNT > 0)

IDLE

WWT

Violation /

WWT Flag;

EOM; Disable

Receiver

(Any Character) &&

(COUNT > 0) /

COUNT--; FIFO

IDLE

Else /

CV Flag;

EOM;

Disable

Receiver

Else /

CV Flag;

EOM;

Disable

Receiver

IDLE

Else /

CV Flag;

EOM;

Disable

Receiver

INS &&

(COUNT > 0)

(Any Character) &&

(COUNT == 1) /

COUNT--; FIFO

SW1 &&

(COUNT > 0) /

FIFO

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