hello leena..

response to ur queries..

1- query..

ur are not able to write error counter again with ff..

this is secure memory card:
see about errorcounter...its one byte i.e 0-7 bits..
initailly this byte is ff i.e 11111111..

if u try to break a password/verify with wrong password
then it become FE i.e 11111110..so on..it will give u 8 attempts to verify..after that it will block card permanently..

u can write on error counter again FF after only after psc verification..

accha about psc verification..the command bytes which are send are not given properly in any datasheet..


verify_psc();
first read error counter..if value returned is zero...then card is blocked..

else:
sequence: write error counter

cmd = 0x4f;
add = 0xfd;
data = shdata;//0x7f //WRITE ERROR COUNTER 0x00 WITH 4f

issue command_entry(cmd,add,dat);

rwtc(); giving 202 clock cycles..

then go for psc verification..two bytes sequence as u stated in ur mail..

then write error counter :
cmd = 0xcf;
add = 0xfd;
dat = 0xff; //WRITE ERROR COUNTER 0xff WITH 0xcf

issue command : command_entry(cmd,add,dat);
rwtc(); again 202 clock cycles..

so this way u can follow verification procedure..


if any further clarification..mail me at mailforsantosh@yahoo.com


regards,

santosh