Toshiba H1 Series - Manual (Page 225)

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)