AX250 datasheet(80/262 Pages) MICROSEMI

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Detailed Specifications

2- 66

R e v i sio n 1 8

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 2-70 • AX125 Dedicated (Hardwired) Array Clock Networks

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

–2 Speed

–1 Speed

Std Speed

Units

Parameter

Description

Min.

Max.

Min.

Max.

Min.

Max.

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 2-71 • AX250 Dedicated (Hardwired) Array Clock Networks

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

–2 Speed

–1 Speed

Std Speed

Units

Parameter

Description

Min.Max.Min.Max.Min.Max.

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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