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TLC5954: tlc5954驱动问题

Part Number: TLC5954


通过fpga对tlc5954芯片做驱动,使用的时钟是5M。fpga与驱动板通过四个引脚连接,sclk,sin,lat,blank
;其中blank始终拉低,现在fpga bit流下载后做驱动,根据协议把信号灌进去后,发现只有sout信号有输出,输出与sin输入一致,其余48个引脚均未拉高。有无大佬指导下问题在哪。