TMP92CZ26A
92CZ26A-222
SDRAM Command Register
7 6 5 4 3 2 1
0
Bit symbol
SCMM2
SCMM1
SCMM0
Read/Write
R/W
After reset
0
0
0
Function
Command
issue
(Note 1) (Note 2)
000: Don’t care
001: Initialization sequence
a. Precharge All command
b. Eight Auto Refresh commands
c. Mode Register Set command
010: Precharge All command
100: Reserved
101: Self Refresh Entry command
110: Self Refresh Exit command
Others: Reserved
Note 1: <SCMM2:0> is automatically cleared to “000” after the specified command is issued. Before writing the next
command, make sure that <SCMM2:0> is “000”. In the case of the Self Refresh Entry command, however,
<SCMM2:0> is not cleared to “000” by execution of this command. Thus, this register can be used as a flag for
checking whether or not Self Refresh is being performed.
Note 2: The Self Refresh Exit command can only be specified while Self Refresh is being performed.
SDRAM HDMA Burst Length Select Register
7 6 5 4 3 2 1 0
Bit
symbol
SDBL5 SDBL4 SDBLS SDBL2 SDBL1 SDBL0
Read/Write
R/W
After
reset
0 0 0 0 0 0
For HDMA5
For HDMA4
For HDMA3
For HDMA2 For HDMA1 For HDMA0
Function
HDMA burst length
0: 1 Word read / Single write
1: Full page read / Burst write
Figure 3.10.1 Control Registers
SDCMM
(0253H)
SDBLS
(0254H)