YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 292

• Manufacturer Part Number: YR0K42378FC000BA
• Description: KIT EVAL FOR H8S/2378
• Manufacturer: Renesas Electronics America
• Series: H8®r
• Type: MCUr

Specifications of YR0K42378FC000BA

• Contents: Board
• For Use With/related Products: H8S/2378
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 6 Bus Controller (BSC)
6.7.8
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.7.00 Mar. 18, 2009 page 224 of 1136
REJ09B0109-0700
Figure 6.46 Example of Access Timing when Row Address Output Hold State Is 1 State
Row Address Output State Control
Read
Write
Address bus
DQMU, DQML
DQMU, DQML
Precharge-sel
Data bus
Data bus
SDRAMφ
(RCD1 = 0, RCD0 = 1, SDWCD = 0, CAS Latency 2)
CKE
CKE
RAS
RAS
CAS
CAS
WE
WE
φ
Column
address
PALL
PALL
T
p
ACTV
ACTV
T
r
Row address
Row address
NOP
High
High
T
rw
NOP
READ
T
c1
Column address
WRIT
T
cl
NOP
NOP
T
c2