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)[reply]

Looks like First byte (TS) is 0x03 when inverse convention — Preceding unsigned comment added by Larytet (talk • contribs) 16:44, 28 June 2012 (UTC)[reply]

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)[reply]

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 T_i	K	(always)
TA₁	maximum clock frequency, proposed bit duration	FI giving f_max and Fi, DI giving Di	5^th bit of T0
TB₁	deprecated V_PP requirements	PI1 giving P, II giving I	6^th bit of T0
TC₁	extra delay between bytes required by card	N giving EGT and ultimately GT	7^th bit of T0
TD₁	a protocol supported by the card, presence of TX₂	T in [0..14]	8^th bit of T0
TA₂	specific protocol and parameters applied by card after the ATR	T in [0..14]	5^th bit of TD₁
TB₂	deprecated V_PP precise voltage requirement	PI2 giving P	6^th bit of TD₁
TC₂	extra delay between bytes required by card	WI ultimately giving WT	7^th bit of TD₁
TD₂	maximum delay between characters under protocol T = 0	T in [0..14]	8^th bit of TD₁

Fgrieu (talk) 07:47, 28 June 2014 (UTC)[reply]

External links modified[edit]

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