DS8007 Datasheet, PDF (34/41 Pages) Dallas Semiconductor – Multiprotocol Dual Smart Card Interface

Multiprotocol Dual Smart Card Interface
tinue 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 immediately after suc-
cessful ATR if bit 5 of the TA(2) character 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 val-
ues 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
—
—
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
TA(1).DI
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0110
—
—
—
—
—
—
—
—
—
1
—
2
1000
1
1
—
2
3
4
5
—
2
—
4
—
Di
RFU
1
2
4
8
16
32
RFU
RFU
12
20
RFU
RFU
RFU
RFU
RFU
1001
—
—
—
—
—
—
3
—
—
—
—
—
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