HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 175

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

8.5.3
Precharge State Control: When the microprocessor clock frequency is raised and the cycle
period shortened, 1 cycle may not always be sufficient for the precharge time for the RAS signal
when the DRAM is accessed. The BSC allows the precharge cycle to be set to 1 state or 2 states
using the RAS signal precharge cycles bit (TPC) in DCR. When the TPC bit is 0, the precharge
cycle is 1 state; when TPC is 1, the precharge cycle is 2 states. Figure 8.19 shows the timing when
the precharge cycle is 2 states.
Read
Write
Wait State Control
WRH, WRL
WRH, WRL
AD15–AD0
AD15–AD0
A21–A0
RAS
CAS
CK
Figure 8.18 Long Pitch Access Timing
T
p
Row address
T r
Rev. 7.00 Jan 31, 2006 page 149 of 658
T
Section 8 Bus State Controller (BSC)
c
1
Column address
T
c
2
REJ09B0272-0700