FG256 datasheet(29/108 Pages) ACTEL

29 / 108 page

SX-A Family FPGAs

v5.3

2-9

Where:

CEQCM = Equivalent capacitance of combinatorial modules

(C-cells) in pF

CEQSM = Equivalent capacitance of sequential modules (R-Cells) in pF

CEQI = Equivalent capacitance of input buffers in pF

CEQO = Equivalent capacitance of output buffers in pF

CEQCR = Equivalent capacitance of CLKA/B in pF

CEQHV = Variable capacitance of HCLK in pF

CEQHF = Fixed capacitance of HCLK in pF

CL = Output lead capacitance in pF

fm = Average logic module switching rate in MHz

fn = Average input buffer switching rate in MHz

fp = Average output buffer switching rate in MHz

fq1 = Average CLKA rate in MHz

fq2 = Average CLKB rate in MHz

fs1 = Average HCLK rate in MHz

m = Number of logic modules switching at fm

n = Number of input buffers switching at fn

p = Number of output buffers switching at fp

q1 = Number of clock loads on CLKA

q2 = Number of clock loads on CLKB

r1 = Fixed capacitance due to CLKA

r2 = Fixed capacitance due to CLKB

s1 = Number of clock loads on HCLK

x = Number of I/Os at logic low

y = Number of I/Os at logic high

Table 2-11 • CEQ Values for SX-A Devices

A54SX08A

A54SX16A

A54SX32A

A54SX72A

Combinatorial modules (CEQCM)

1.70 pF

2.00 pF

1.80 pF

Sequential modules (CEQCM)

1.50 pF

1.30 pF

1.50 pF

Input buffers (CEQI)

1.30 pF

Output buffers (CEQO)

7.40 pF

Routed array clocks (CEQCR)

1.05 pF

Dedicated array clocks – variable

(CEQHV)

0.85 pF

Dedicated array clocks – fixed (CEQHF)

30.00 pF

55.00 pF

110.00 pF

240.00 pF

Routed array clock A (r1)

35.00 pF

50.00 pF

90.00 pF

310.00 pF

FG256 Datasheet(PDF) 29 Page - Actel Corporation

FG256 Datasheet(HTML) 29 Page - Actel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL