DS8007_11 Datasheet, PDF (34/41 Pages) Maxim Integrated Products – Multiprotocol Dual Smart Card Interface 8kV (min) ESD Protection on Card Interfaces

Multiprotocol Dual Smart Card Interface
parameters continue to be used until a successful PPS
exchange is completed. The negotiated Fn, Dn values
are then used after a successful PPS exchange. If the
card comes up in specific mode (i.e., TA(2) is present
in ATR), then the indicated Fi, Di values apply immedi-
ately after successful ATR if bit 5 of the TA(2) charac-
ter is 0. If bit 5 of TA(2) is 1, implicit values should be
used. The TA(1) character of ATR, if present, contains
the Fi and Di values indicated by the card.
Table 5 demonstrates how the prescaler (PSC) bit and
programmable divider register (PDRx) can be config-
ured to generate the requested F/D ratios. All settings
assume that the CKU bit is configured to its reset
default logic 0 state.
Table 4. Fi, Di Parameter Possibilities
TA(1).Fi
Fi
0000
372
0001
372
0010
558
0011
744
0100
1116
0101
1488
0110
1860
0111
RFU
1000
RFU
1001
512
1010
768
1011
1024
1100
1536
1101
2048
1110
RFU
1111
RFU
RFU = Reserved for future use.
MAX CLKx (MHz)
4
5
6
8
12
16
20
—
—
5
7.5
10
15
20
RFU
RFU
Fi =
31 x 12
31 x 12
31 x 18
31 x 24
31 x 36
31 x 48
31 x 60
—
—
32 x 16
32 x 24
32 x 32
32 x 48
32 x 64
—
—
TA(1).Di
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Table 5. PSC, PDR Settings to Support F, D Parameters
TA(1).Fi
0000
0001
0010
0011
0100
0101
0110
1001
1010
1011
1100
1101
PSC
0 = /31
1 = /32
0
0
0
0
0
0
0
1
1
1
1
1
0001
12
12
18
24
36
48
60
16
24
32
48
64
0010
6
6
9
12
18
24
30
8
12
16
24
32
0011
3
3
—
6
9
12
15
4
6
8
12
16
PDR SETTING FOR Di =
0100
—
—
—
3
—
6
—
2
3
4
6
8
0101
—
—
—
—
—
3
—
1
—
2
3
4
0110
—
—
—
—
—
—
—
—
—
1
—
2
Di
RFU
1
2
4
8
16
32
RFU
RFU
12
20
RFU
RFU
RFU
RFU
RFU
1000
1
1
—
2
3
4
5
—
2
—
4
—
1001
—
—
—
—
—
—
3
—
—
—
—
—
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