Table of Contents
Advertisement
DIMM 3 Parameters Register (0x1E00_0030)
127
31
Field
DSL
–
Other parameters use the same values as DIMM 0.
6.5.2 Operation Mode Register (0x1E00_0040) R/W
127
31
This register is used to execute commands other than standard memory reads and writes to
the SDRAM. Bits [12:10] are used to check the current state of the SDRAM Controller.
Field
OPM
–
Stat
–
TX7901 User's Manual (Rev. 6.30T – Nov, 2001)
Chapter 6: SDRAM Memory Controller
0
96
0
30
Bit
Device Select (01)
00 : 16 Mb SDRAM
1:0
01 : 64/128 Mb SDRAM
10 : 256 Mb SDRAM
11 : Reserved
31:2
Reserved
0
96
0
19
Bit(s)
Operation Mode (001)
000 : Normal SDRAM Mode (Read/Write)
001 : NOP Commands
010 : Precharge All Banks
2:0
011 : Writing to the SDRAM Mode Register. Each
DIMM could have a different Mode.
100 : Force a Refresh Cycle
Others : Reserved
9:3
Reserved (0)
Status (read only)
000 : Idle
001 : Page Activation
010 : Precharge
12:10
011 : Write Mode Register
100 : Refresh
101 : Read
110 : Write
111 : Reserved
31:13
Reserved (0)
6-12
R/W
Description
13 12
10 9
S
T
0
A
T
3
7
Description
32
2 1
0
D
S
L
2
32
3 2
0
O
P
M
3
Advertisement
Table of Contents
