EP2S15 ALTERA [Altera Corporation], EP2S15 Datasheet - Page 59

• Manufacturer Part Number: EP2S15
• Description: Stratix II Device Family
• Manufacturer: ALTERA [Altera Corporation]

Figure 2–33. Dual-Regional Clocks
Figure 2–34. Hierarchical Clock Networks Per Quadrant
Altera Corporation
May 2007
PLLs
CLK[3..0]
Regional Clock Network [7..0]
Global Clock Network [15..0]
Clock Pins or PLL Clock Outputs
Can Drive Dual-Regional Network
CLK[7..4]
CLK[15..12]
Combined Resources
Within each quadrant, there are 24 distinct dedicated clocking resources
consisting of 16 global clock lines and eight regional clock lines.
Multiplexers are used with these clocks to form busses to drive LAB row
clocks, column IOE clocks, or row IOE clocks. Another multiplexer is
used at the LAB level to select three of the six row clocks to feed the ALM
registers in the LAB (see Figure 2–34).
CLK[11..8]
or Half-Quadrant
Clocks Available
to a Quadrant
Clock [23..0]
Clock Pins or PLL Clock
Outputs Can Drive
Dual-Regional Network
PLLs
CLK[3..0]
Stratix II Device Handbook, Volume 1
CLK[7..4]
CLK[15..12]
Stratix II Architecture
Column I/O Cell
IO_CLK[7..0]
Lab Row Clock [5..0]
Row I/O Cell
IO_CLK[7..0]
CLK[11..8]
2–51