Data Sheet
June 1999
ORCA Series 3C and 3T FPGAs
Timing Characteristics (continued)
(continued)
Table 43. Ripple Mode PFU Timing Characteristics
OR3Cxx Commercial: VDD = 5.0 V ± 5%, 0 °C < TA < 70 °C; Industrial: VDD = 5.0 V ± 10%, –40 °C < TA < +85 °C.
OR3Txxx Commercial: VDD = 3.0 V to 3.6 V, 0 °C < TA < 70 °C; Industrial: VDD = 3.0 V to 3.6 V, –40 °C < TA < +85 °C.
Speed
Parameter
Unit
Symbol
-4
-5
-6
-7
J
DD
(T = +85 °C, V = min)
Min Max Min Max Min Max Min Max
Full Ripple Delays (byte wide):
RIPCO_DEL
RIPFCO_DEL
RIP_DEL
Operands to Carry-out (Kz[1:0] to COUT)
Operands to Carry-out (Kz[1:0] to FCOUT)
Operands to PFU Out (Kz[1:0] to F[7:0])
Bitwise Operands to PFU Out (Kz[1:0] to F[z])
Fast Carry-in to Carry-out (FCIN to COUT)
Fast Carry-in to Fast Carry-out (FCIN to FCOUT)
Carry-in to Carry-out (CIN to COUT)
Carry-in to Fast Carry-out (CIN to FCOUT)
Fast Carry-in PFU Out (FCIN to F[7:0])
Carry-in PFU Out (CIN to F[7:0])
—
—
—
—
—
—
—
—
—
—
—
—
—
5.32
5.30
7.37
2.34
2.59
2.57
3.47
3.46
6.03
6.91
8.28
8.11
10.66
—
—
—
—
—
—
—
—
—
—
—
—
—
4.11
4.10
5.60
1.80
1.99
1.98
2.65
2.64
4.55
5.21
5.89
5.78
7.55
—
—
—
—
—
—
—
—
—
—
—
—
—
2.98
2.98
4.18
1.32
1.43
1.41
1.79
1.78
3.21
3.53
4.58
4.48
5.85
—
—
—
—
—
—
—
—
—
—
—
—
—
2.32 ns
2.32 ns
3.10 ns
1.05 ns
1.14 ns
1.13 ns
1.43 ns
1.43 ns
2.51 ns
3.05 ns
3.45 ns
3.38 ns
4.38 ns
FRIP_DEL
FCINCO_DEL
FCINFCO_DEL
CINCO_DEL
CINFCO_DEL
FCIN_DEL
CIN_DEL
ASCO_DEL
ASFCO_DEL
AS_DEL
Add/Subtract to Carry-out (ASWE to COUT)
Add/Subtract to Carry-out (ASWE to FCOUT)
Add/Subtract to PFU Out (ASWE to F[7:0])
Half Ripple Delays (nibble wide):
HRIPCO_DEL
HRIPFCO_DEL
HRIP_DEL
Operands to Carry-out (Kz[1:0] to COUT)
Operands to Fast Carry-out (Kz[1:0] to FCOUT)
Operands to PFU Out (Kz[1:0] to F[3:0])
Bitwise Operands to PFU Out (Kz[1:0] to F[z])
Fast Carry-in to Carry-out (FCIN to COUT)
Fast Carry-in to Fast Carry-out (FCIN to FCOUT)
Carry-in to Carry-out (CIN to COUT)
Carry-in to Carry-out (CIN to FCOUT)
Fast Carry-in PFU Out (FCIN to F[3:0])
Carry-in PFU Out (CIN to F[3:0])
—
—
—
—
—
—
—
—
—
—
—
—
—
5.32
5.30
5.50
2.34
2.59
2.57
3.47
3.46
3.76
4.65
8.28
8.11
9.12
—
—
—
—
—
—
—
—
—
—
—
—
—
4.11
4.10
4.07
1.80
1.99
1.98
2.65
2.64
2.84
3.50
5.89
5.78
6.49
—
—
—
—
—
—
—
—
—
—
—
—
—
2.98
2.98
3.20
1.32
1.43
1.41
1.79
1.78
2.01
2.33
4.58
4.48
4.86
—
—
—
—
—
—
—
—
—
—
—
—
—
2.32 ns
2.32 ns
2.40 ns
1.05 ns
1.14 ns
1.13 ns
1.43 ns
1.43 ns
1.58 ns
2.12 ns
3.45 ns
3.38 ns
3.69 ns
HFRIP_DEL
HFCINCO_DEL
HFCINFCO_DEL
HCINCO_DEL
HCINFCO_DEL
HFCIN_DEL
HCIN_DEL
HASCO_DEL
HASFCO_DEL
HAS_DEL
Add/Subtract to Carry-out (ASWE to COUT)
Add/Subtract to Carry-out (ASWE to FCOUT)
Add/Subtract to PFU Out (ASWE to F[3:0])
ORCA
Note: The table shows worst-case delay for the ripple chain.
be less than or equal to those listed above.
Foundry reports the delay for individual paths within the ripple chain that will
108
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