* @param page_shift [INTERN] number of address bits in a page
* @param ppb_shift [INTERN] number of address bits in a pages per block
* @param page_mask [INTERN] a page per block mask
+ * @param writesize [INTERN] a real page size
* @param bufferam_index [INTERN] BufferRAM index
* @param bufferam [INTERN] BufferRAM info
* @param readw [REPLACEABLE] hardware specific function for read short