SyncFlash Operation
MOTOROLA
SDRAM Memory Controller
24-69
24.9.6 Clock Suspend Timer Use with SyncFlash
The SyncFlash enters clock suspend mode when the CLKST[1:0] bits are set to 10 or 11 in the SDRAM
control register (SDCTL0/1). The clock to the SyncFlash memory will stop after a programmable delay
following the last access to the SyncFlash (64 clock cycles for CLKST=10 or 128 clock cycles for
CLKST = 11). When CLKST is set to 10 or 11, the active bank is not closed (no Precharge command is
issued) before the entry into the clock suspend mode. Figure 24-57 illustrates this timing relationship.
Table 24-51. SyncFlash Command Sequences
Operation
1st Cycle
2nd Cycle
3rd Cycle
CMD
ADDR
ADDR
DQ
CMD
ADDR
ADDR
DQ
CMD
ADDR
ADDR
DQ
Read
Device
Configu-
ration
LCR
90H
Bank
X
ACT
Row
Bank
X
READ
CA
Bank
X
Read
Status
Register
LCR
70H
X
X
ACT
X
X
X
READ
X
X
X
Clear
Status
Register
LCR
50H
X
X
—
—
—
—
—
—
—
—
Erase
Setup/
Confirm
LCR
20H
Bank
X
ACT
Row
Bank
X
WRITE
X
Bank
D0H
Write
Setup/
Confirm
LCR
40H
Bank
X
ACT
Row
Bank
X
WRITE
Col
Bank
D1H
Protect
Block/
Confirm
LCR
60H
Bank
X
ACT
Row
Bank
X
WRITE
X
Bank
01H
Protect
Device/
Confirm
LCR
60H
Bank
X
ACT
X
Bank
X
WRITE
X
Bank
F1H
Unprotect
Blocks/
Confirm
LCR
60H
Bank
X
ACT
X
Bank
X
WRITE
X
Bank
D0H
Erase
NVMODE
Register
LCR
30H
Bank
X
ACT
X
Bank
X
WRITE
X
Bank
C0H
Write
NVMODE
Register
LCR
A0H
Bank
X
ACT
X
Bank
X
WRITE
X
Bank
X
Содержание DragonBall MC9328MX1
Страница 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Страница 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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