基于AMBA总线的SPI协议IP核的设计与验证

https://wenku.baidu.com/view/9542213131126edb6f1a1048.html?mark_pay_doc=2&mark_rec_page=1&mark_rec_position=4&clear_uda_param=1

http://blog.csdn.net/mr_raptor/article/details/6558233

https://www.cnblogs.com/wisdomjoyce/p/3601494.html