HC4GX15 Datasheet, PDF(129/668 Page) Altera Corporation – HardCopy IV Device Handbook

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HC4GX15 Datasheet, PDF (129/668 Pages) Altera Corporation – HardCopy IV Device Handbook

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Chapter 8: High-Speed Differential I/O Interfaces and DPA in HardCopy IV Devices

Differential Pin Placement Guidelines

8â19

Figure 8â19. Center Left/Right PLLs Driving DPA-Enabled Differential I/Os

Maximum 26 channels

driven by the center

left/right PLL

Maximum 26 channels

driven by the center

left/right PLL

Corner

Left/Right PLL

Reference

CLK

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

Reference

CLK

Center

Left/Right PLL

Center

Left/Right PLL

Reference

CLK

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

Reference

CLK

Corner

Left/Right PLL

Corner

Left/Right PLL

Reference

CLK

DPA-enabled

Diff I/O

Maximum 26 channels

driven by the upper center

left/right PLL

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

Reference

CLK

Center

Left/Right PLL

Center

Left/Right PLL

Maximum 26 channels

driven by the upper center

left/right PLL

Reference

CLK

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

DPA-enabled

Diff I/O

Reference

CLK

Corner

Left/Right PLL

Maximum 26 channels

driven by the upper center

left/right PLL

One Unused

Channel for Buffer

Maximum 26 channels

driven by the upper center

left/right PLL

If the top PLL_L2/PLL_R2 drives DPA-enabled channels in the lower differential

bank, the PLL_L3/PLL_R3 cannot drive DPA-enabled channels in the upper

differential banks and vice versa. In other words, the center left or right PLLs cannot

drive cross-banks simultaneously, as shown in Figure 8â20.

Â© January 2010 Altera Corporation

HardCopy IV Device Handbook, Volume 1

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