F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 11/04/2024
Public
Document Table of Contents

2.4.1.2. FGT and System PLL Reference Clock Network

Thee ae te efeece clocks fo FGT PMAs. Eight of the FGT efeece clocks (efclk[0]-efclk[7]) ca be cofigued as iput pots. The emaiig two FGT efeece clocks ae bidiectioal. The FGT efeece clock fequecy age is 25-380 MHz (25-100 MHz fo HDMI oly).

efclk[0]-efclk[7] ca also be shaed as efeece clocks fo system PLLs. Refe to System PLL fo details. The system PLL efeece clock fequecy age is 100-380 MHz.

Thee ae thee FGT ad system PLL efeece clock types.

  • Global efeece clocks ae accessible by fou FGT quads.
  • Regioal efeece clocks ae accessible by two quads.
  • Local efeece clocks ae accessible by oe quad.

Global ad egioal efeece clocks ae also accessible by system PLLs. See the followig table fo details.

Ay had IP that spas FGT quads must use a efeece clock that is accessible by all quads. Fo example, PCIe* x16 ca oly use efclk[2], efclk[3], efclk[4], ad efclk[5].

Figue 51. FGT ad System PLL Refeece Clock Netwok
Table 23.  FGT ad System PLL Refeece Clocks
FGT ad System PLL Refeece Clocks Type Diectio Accessible to FGT PMAs? Accessible FGT Quads Accessible to System PLLs? Accessible System PLL
efclk[0] Regioal Iput Yes Quad0, Quad1 Yes System PLL 1, 2, ad 3
efclk[1] Regioal Iput Yes Quad0, Quad1 Yes System PLL 1, 2, ad 3
efclk[2] Global Iput Yes Quad0, Quad1, Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[3] Global Iput Yes Quad0, Quad1, Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[4] Global Iput Yes Quad0, Quad1, Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[5] Global Iput Yes Quad0, Quad1, Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[6] Regioal Iput Yes Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[7] Regioal Iput Yes Quad2, Quad3 Yes System PLL 1, 2, ad 3
efclk[8] Local Iput o output 14 Yes Quad2 No N/A
efclk[9] Local Iput o output14 Yes Quad3 No N/A
14 Whe cofigued as a output, output pis povide a RX ecoveed clock fom oe of the fou FGT PMAs (fom a accessible quad). You ca maually select this FGT PMA at u time.
  • This RX ecoveed clock is valid afte the espective PMA achieves lock-to-data (LTD).
  • The pimay use case of this cofiguatio is the CPRI potocol. Refe to the F-Tile CPRI PHY Itel® FPGA IP Use Guide fo the suppoted ecoveed clock fequecies.