Specifications
140 AMD Geode™ GeodeROM Functional Specification
System Services
32087C
MR SDRAM clock ratio 3 Bits 000 = Reserved
001 = 2.0
010 = 2.5
011 = 3.0
100 = 3.5
101 = 4.0
110 = 4.5
111 = 5.0
MD SDRAM drive/slew 3 Bits 000 = Lowest drive strength
001…
111 = Highest drive strength
MS SDRAM shift SDCLK 3 Bits 000 = No shift
001 = Shift 0.5 core clocks
010 = Shift 1.0 core clocks
011 = Shift 1.5 core clocks
100 = Shift 2.0 core clocks
101 = Shift 2.5 core clocks
110 = Shift 3.0 core clocks
111 = Reserved
MC CAS latency 3 Bits 000 = Reserved
001 = Reserved
010 = 2 CLKs
011 = 3 CLKs
100 = 4 CLKs
101 = 5 CLKs
110 = 6 CLKs
111 = 7 CLKs
M1 tRC 4 Bits 0000 = Reserved
0001 = 2 CLKs
0010 = 3 CLKs
1111 = 16 CLKs
All other decodes = Reserved
M2 tRAS 4 Bits 0000 = Reserved
0001 = 2 CLKs
0010 = 3 CLKs
1111 = 16 CLKs
All other decodes = Reserved
M3 tRP 3 Bits 000 = Reserved
001 = 1 CLK
010 = 2 CLKs
111 = 7 CLKs
All other decodes = Reserved
M4 tRCD 3 Bits 000 = Reserved
001 = 1 CLK
010 = 2 CLKs
111 = 7 CLKs
All other decodes = Reserved
M6 TDPL 3 Bits 000 = Reserved
001 = 1 CLK
010 = 2 CLKs
111 = 7 CLKs
All other decodes = Reserved
Table 12-4. NVRAM Table (Continued)
Token
1
Description Width Definition