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[v1-04] 2016-Jan-07

AS3953B − Detailed Description

SAK

SAK is response to SELECT command. AS3953B UID has double

size, which defines SAK responses for Cascade Level 1 and

Cascade Level 2.

Cascade Level 1: According to ISO 14443-3, all bits except b3

are “don’t care” for Cascade Level 1. Figure below defines

Cascade Level 1 coding.

Figure 16:

Cascade Level1 Coding

Bit b6 in Cascade Level 1 is always set as bit b6 in Cascade Level

2. This is done in accordance to EMVCo Level – 1 Contactless

Digital Test specifications.

Cascade Level 2: According to ISO 14443-3 all bits except b6

and b3 are “don’t care” for Cascade Level 2.

If configuration bit16 [nl4] is set to logic ‘0’ (default state), the

SAK on Cascade Level 2 reports that tag is compliant to level4

(see figure below).

Figure 17:

Cascade Level 2 Coding (ISO/IEC14443-4 compliant)

If configuration bit16 [nl4] is set to logic ‘1’, the SAK on Cascade

Level 2 reports that tag is NOT compliant to Level-4 (see figure

below).

Figure 18:

Cascade Level 2 Coding (NOT ISO/IEC14443-4 compliant)

MSB

LSB

Description

As b6 in

SAK CL2

00100

Cascade bit set: UID not

complete

MSB

LSB

Description

01000

UID complete, tag is

compliant to

ISO/IEC14443-4

MSB

LSB

Description

00000

UID complete, tag is NOT

compliant to

ISO/IEC14443-4

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