AX2000-1CS896M datasheet(69/226 Pages) ACTEL

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Axcelerator Family FPGAs

v2.7

2-55

Global Resources

One of the most important aspects of any FPGA

architecture is its global resources or clocks. The

Axcelerator family provides the user with flexible and

easy-to-use global resources, without the limitations

normally found in other FPGA architectures.

The AX architecture contains two types of global

resources, the HCLK (hardwired clock) and CLK (routed

clock). Every Axcelerator device is provided with four

HCLKs and four CLKs for a total of eight clocks,

regardless of device density.

Hardwired Clocks

The hardwired (HCLK) is a low-skew network that can

directly drive the clock inputs of all sequential modules

(R-cells, I/O registers, and embedded RAM/FIFOs) in the

device with no antifuse in the path. All four HCLKs are

available everywhere on the chip.

Timing Characteristics

Table 2-69 • AX125 Dedicated (Hardwired) Array Clock Networks

Worst-Case Commercial Conditions VCCA = 1.425V, VCCI = 3.0V, TJ = 70°C

'–2' Speed

'–1' Speed

'Std' Speed

Parameter

Description

Min.

Max.

Min.

Max.

Min.

Max.

Units

Dedicated (Hardwired) Array Clock Networks

tHCKL

Input Low to High

3.02

3.44

4.05

tHCKH

Input High to Low

3.03

3.46

4.06

tHPWH

Minimum Pulse Width High

0.58

0.65

0.77

tHPWL

Minimum Pulse Width Low

0.52

0.59

0.69

tHCKSW

Maximum Skew

0.06

0.07

0.08

tHP

Minimum Period

1.15

1.31

1.54

tHMAX

Maximum Frequency

870

763

649

MHz

Table 2-70 • AX250 Dedicated (Hardwired) Array Clock Networks

Worst-Case Commercial Conditions VCCA = 1.425V, VCCI = 3.0V, TJ = 70°C

'–2' Speed

'–1' Speed

'Std' Speed

Parameter

Description

Min.

Max.

Min.

Max.

Min.

Max.

Units

Dedicated (Hardwired) Array Clock Networks

tHCKL

Input Low to High

2.57

2.93

3.45

tHCKH

Input High to Low

2.61

2.97

3.50

tHPWH

Minimum Pulse Width High

0.58

0.65

0.77

tHPWL

Minimum Pulse Width Low

0.52

0.59

0.69

tHCKSW

Maximum Skew

0.06

0.07

0.08

tHP

Minimum Period

1.15

1.31

1.54

tHMAX

Maximum Frequency

870

763

649

MHz

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