USR_ACCESS 寄存器实现 PowerPC 高速缓存配置 Application Note: Virtex-4 FX Family R PowerPC Cache Configuration Using the USR_ACCESS_VIRTEX4 Register Author: Nick Camilleri and Peter Ryser XAPP719 (v1.1) March 13, 2006 Summary The Virtex-4 user access register (USR_ACCESS_VIRTEX4) is a 32-bit register that provides direct access to bitstream data by the FPGA fabric. It is useful for loading PowerPC 405 (PPC405) proc……