Hello every one. Now I have a C164 board "SK-164" made by phytec. In the page 39 of the hardware manual, it says that "if use Chip-Select Signals to decode address, the JP9 should be on 1+2 state and JP4 should be opened. On this ocassion, /CS0 (P4.3) selects the Flash memory installed at U8/U9 (Flash bank) with a total memory of 64 kByte. /CS1 (P4.2) selects the RAM bank at U10/U11 with a total memory of 64 kByte." But I don't know why the memory is limited to 64 kByte. On page 33,it alse says that "If jumper JP8 is open at 7+8 and open at 9+10 two Chip-Selects ( /CS0 and /CS1 for the on-board memory) are available, the address space for each Chip-Select is limited to 256 kByte." Can you help me? Thanks.