
Chapter 2: Board Components 2–27
Clocking Circuitry
May 2013 Altera Corporation Stratix III 3SL150 Development Board
Reference Manual
Stratix III FPGA Clock Outputs
Figure 2–8 outlines the outputs from the Stratix III FPGA. Most of the output clocks
originate from the regular I/O pins (non-PLL pins). These clocks drive each of the
interfaces on the Stratix III development board.
Table 2–19 shows the clocking parts list.
Figure 2–8. Stratix III FPGA Clock Outputs
Bank 8
1.8 V
Bank 7
1.5 V
Bank 3
1.8 V
Bank 4
1.8 V, 2.5 V
Bank 6
2.5 V
Bank 5
2.5 V
Bank 1
1.8 V
Bank 2
2.5 V
FLASH QDRII+
FLASH_CLK
QDRII_K_P
QDRII_K_N
SRAM
DDR2
A
DDR2
B
SRAM_CLK
DDR2_DEVA_CK_P
DDR2_DEVA_CK_N
SMA
Output
DDR2_DEVB_CK_P
DDR2_DEVB_CK_N
ENET
PHY
ENET_TX_CLK
ENET_GTX_CLK
DDR2_DEVB_CK_P
DDR2_DEVB_CK_N
DDR2_DEVB_CK_N
DDR2 DIMM
DDR2_DIMM_CLK_N2
DDR2_DIMM_CLK_N2
DDR2_DIMM_CLK_N2
DDR2_DIMM_CLK_N2
DDR2_DIMM_CLK_N2
DDR2_DIMM_CLK_N2
HSMB_CLK_OUT_N2
HSMB_CLK_OUT_P2
HSMB_CLK_OUT_N1
HSMB_CLK_OUT_P1
HSMC
Port B
HSMA_CLK_OUT_N2
HSMA_CLK_OUT_P2
HSMA_CLK_OUT_N1
HSMA_CLK_OUT_P1
HSMC
Port A
Table 2–19. Stratix III Development Board Clocking Parts List
Board
Reference
Description Manufacturer
Manufacturer
Part Number
Manufacturer
Website
Y6 50-MHz LVDS oscillator Pletronics SM5545TEX-50.00M www.pletronics.com
Y1,Y5 125-MHz LVDS oscillator Pletronics SM5545TEX-125.00M www.pletronics.com
J16, J17
SMA for external clock
input/output
Lighthorse Technologies LTI-SASF546-P26-X1 www.rfconnector.com
Y2 24-MHz crystal Abracon Corporation ABL-24.000MHZ-12 www.abracon.com
Y3 6-MHz crystal Abracon Corporation ABL-6.000MHZ-B2 www.abracon.com
X1 25-MHz crystal oscillator ECS, Inc. ECS-3953C-250-B www.ecsxtal.com
Y4 24-MHz crystal oscillator Pletronics SM5545TEX-24.00M www.pletronics.com
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