Talk:Answer to reset
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Does the 1st byte of initial character signify any thing else other that direct and indirect convention?
A: The initial character TS codes the convention, and may allow confirmation (or determination) of the ETU, which is 1/3 of the time between the first and second falling edge in TS. Its very presence also attest that the card is alive. It has no other normative meaning. Fgrieu (talk) 14:59, 27 August 2011 (UTC)
Looks like First byte (TS) is 0x03 when inverse convention — Preceding unsigned comment added by Larytet (talk • contribs) 16:44, 28 June 2012 (UTC)
A: The operative word is Looks! When decoded by a UART set for direct convention, the TS of inverse convention is received as a byte with value 0x03 in the UART; but when (properly) decoded per inverse convention (that is, a low voltage L coding a 1 rather than a 0 in direct convention, and most significant bit of the byte first rather than last in direct convention), the value decoded is 0x3F, as stated by all editions of ISO/IEC 7816-3. Fgrieu (talk) 15:31, 24 June 2014 (UTC)
What about a summary like
Name | Defines | Encodes | Present when there is 1 in |
TS | bit order and polarity | (always) | |
T0 | presence of TX1 and Ti | K | (always) |
TA1 | maximum clock frequency, proposed bit duration | FI giving fmax and Fi, DI giving Di | 5th bit of T0 |
TB1 | deprecated VPP requirements | PI1 giving P, II giving I | 6th bit of T0 |
TC1 | extra delay between bytes required by card | N giving EGT and ultimately GT | 7th bit of T0 |
TD1 | a protocol supported by the card, presence of TX2 | T in [0..14] | 8th bit of T0 |
TA2 | specific protocol and parameters applied by card after the ATR | T in [0..14] | 5th bit of TD1 |
TB2 | deprecated VPP precise voltage requirement | PI2 giving P | 6th bit of TD1 |
TC2 | extra delay between bytes required by card | WI ultimately giving WT | 7th bit of TD1 |
TD2 | maximum delay between characters under protocol T = 0 | T in [0..14] | 8th bit of TD1 |
Fgrieu (talk) 07:47, 28 June 2014 (UTC)
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