Row Address Output State Control - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

6.7.8

Row Address Output State Control

When the command interval specification from the ACTV command to the next READ/WRIT
command cannot be satisfied, 1 to 3 states (Trw) that output the NOP command can be inserted
between the Tr cycle that outputs the ACTV command and the Tc1 cycle that outputs the column
address by setting the RCD1 and RCD0 bits of DRACCR. Use the optimum setting for the wait
time according to the synchronous DRAM connected and the operating frequency of this LSI.
Figure 6.46 shows an example of the timing when the one Trw state is set.
Rev. 1.0, 09/01, page 188 of 904