12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 545 of 1658
REJ09B0261-0100
write
MCK
Command
Data
MCKE
MODT
Terminatin
g
resistor
in SDRAM
As shown in the above fi
g
ure, when CL is 4, the effective ODT control si
g
nal
(MODT) to the SDRAM can be asserted at the same timin
g
as the issue of the
WRITE command. If CL is 5 or
g
reater, MODT is asserted after the issue of the
WRITE command. However, if CL is 3 or less, MODT needs to be asserted
before the issue of the WRITE command, which is not supported by this LSI.
Resistor ON
tAOND
= 2 cycles
3 cycles
for product
with CL = 4
Hi
g
h level
tAOFD
= 2.5 cycles
Figure 12.21 ODT Control Signal when CL = 4
Содержание SH7781
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