Why can't the crystal oscillator be placed on the edge of the PCB?

A2F200M3F 1FGG256I

A2F200M3F 1FGG256I 微芯片技术FPGA SmartFusion Family 200K Gates 100MHz 130nm Technology 1.5V 256-Pin FBGA

M2S090TS FCSG325I

M2S090TS FCSG325I微芯片技术FPGA SmartFusion2 Family 86184 Cells 65nm Technology 1.2V 325-Pin FCBGA Tray

ATSAM4S4BB-MNR

ATSAM4S4BB-MNR微芯片技术ATSAM4S4BB-MNR Microcontrollers Microchip Technology MCU 32-bit ARM Cortex M4 RISC 256KB Flash 1.2V/3.3V 64-Pin

M2S060T 1FGG484M

M2S060T 1FGG484M微芯片技术FPGA SmartFusion2 Family 56520 Cells 65nm Technology c 484-Pin FBGA Tray

M2S050-1VF400

M2S050-1VF400微芯片技术FPGA SmartFusion2 Family 56340 Cells 65nm Technology 1.2V 400-Pin VFBGA Tray

M2S025T 1FGG484I

M2S025T 1FGG484I微芯片技术FPGA SmartFusion2 Family 27696 Cells 65nm Technology 1.2V 484-Pin FBGA Tray

M2S010-1TQG144

M2S010-1TQG144现场可编程门阵列。FPGAsFPGA SmartFusion2 Family 12084 Cells 65nm Technology 1.2V 144-Pin TQFP Tray

M2S060T 1FGG484I

M2S060T 1FGG484I FPGA SmartFusion2 Family 56520 Cells 65nm Technology 1.2V 484-Pin FBGA Tray

M2S060 VFG400I

M2S060 VFG400I微芯片技术FPGA SmartFusion2 Family 56520 Cells 65nm Technology 1.2V 400-Pin VFBGA Tray