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Using PBO and FBO for pixel readback

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I have an application where I do rendering and then read back the rendered image. Previously I used PBOs and framebuffers to read back the image, i.e.,



ptr = glMapBuffer(GL_PIXEL_PACK_BUFFER,pbo2);
//read back image
//swap pbo1 and pbo2 for next iteration

If I want to use FBO instead of framebuffers, do I need to create two renderbuffers to avoid stalls? The two renderbuffers will just replace the front and back buffers in the previous method.

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