This section describes various PIN block formats. The following notations describe the contents of PIN blocks:

P =

A 4-bit decimal digit that is one digit of the PIN value.

C =

A 4-bit hexadecimal control value. The valid values are X'0', X'1', and X'2'.

L =

A 4-bit hexadecimal value that specifies the number of PIN digits. The value ranges from 4 to 12, inclusive.

F =

A 4-bit field delimiter of value X'F'.

f =

A 4-bit delimiter filler that is either P or F, depending on the length of the PIN.

D =

A 4-bit decimal padding value. All pad digits in the PIN block have the same value.

X =

A 4-bit hexadecimal padding value. All pad digits in the PIN block have the same value.

x =

A 4-bit hexadecimal filler that is either P or X, depending on the length of the PIN.

R =

A 4-bit hexadecimal random digit. The sequence of R digits can each take a different value.

r =

A 4-bit random filler that is either P or R, depending on the length of the PIN.

Z =

A 4-bit hexadecimal zero (X'0').

z =

A 4-bit zero filler that is either P or Z, depending on the length of the PIN.

S =

A 4-bit hexadecimal digit that constitutes one digit of a sequence number.

A =

A 4-bit decimal digit that constitutes one digit of a user-specified constant.