1 . 9 System Memory
The top-left edge of the PCA-6275 contains three sockets for 168-pin dual inline memory modules (DIMMs). All three sockets use 3.3 V unbuffered synchronous DRAMs (SDRAM). DIMMs are available in capacities of 16, 32, 64, 128, or 256 MB. The sockets can be filled in any combina- tion with DIMMs of any size, giving your PCA-6275 single board computer between 16 and 768 MB of memory. Use the following table to calculate the total DRAM memory within your computer:
Table 1-6: DIMM module allocation table
Socket number | 168-pin DIMM memory |
1 | (16, 32, 64, 128 | or 256 | MB) x 1 |
| | | | |
2 | (16, 32, 64, | 128 | or 256 | MB) x 1 |
| | | | |
3 | (16, 32, 64, | 128 | or 256 | MB) x 1 |
1.9.1 Sample calculation: DIMM memory capacity
Suppose you install a 128 MB DIMM into your PCA-6275's socket 1, a 32 MB DIMM into socket 2, and you leave socket 3 empty. Your total system memory is 160 MB, calculated as follows:
Table 1-7: DIMM memory capacity sample calculation
Socket number | 168-pin | DIMM memory | Total memory |
1 | 128 MB | x 1 | 128 MB |
| | | |
2 | 32 MB | x 1 | 32 MB |
| | | |
3 | - | x 1 | 0 MB |
Total memory | | | 160 MB |
| | | |
