TMP92CF30
2009-06-12
92CF30-198
(4)
Read data shift function
If the AC specifications of the SDRAM cannot be satisfied when data is read from the
SDRAM, the read data can be latched in a port circuit so that the CPU can read the data in the
next state. When this read data shift function is used, the read cycle requires additional one
state. The write cycle is not affected. The timing waveforms for various cases are shown below.
(a)
1-word read, the read data shift function disabled (SDACR<SRCS> = “0”)
(b)
1-word read, the read data shift function enabled (SDACR<SRDS> = “1”,
<SRDSCK>= “0”)
CPU data read
SDCLK
COMMAND
ACTIVE
NOP
NOP
READ
NOP
D15-D0
DIN1
ACTIVE
A15-A0
Row Address
ColumnAddress
Internal system
clock
Internal dat bus
DIN1
Row Address
READ
Column
Address
SDCLK
COMMAND
ACTIVE
NOP
NOP
READ
NOP
D15-D0
DIN1
ACTIVE
A15-A0
Row Address
NOP
Internal system clock
Internal data bus
DIN1
External data latch
CPU data read
Row Address
ColumnAddress
Содержание TLCS-900/H1 Series
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