HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 813

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

804
Note: An auto-refresh cycle is always preceded by a precharge cycle. The number of cycles
between the two is determined by the number of cycles specified by TRP.
CKIO
Address
upper bits
Address
lower bits
BS
CSn
RD/WR
RD
WEn
DQMxx
D31–D0
DACKn
WAIT
RAS
CAS
OE
CKE
Figure 21.30 Synchronous DRAM Auto-Refresh Cycle
tRWD
tRASD1
tCASD1
tAD
Trr
tRASD1
tCASD1
tAD
tCSD1
Trc1
(TRAS = 4 Cycles)
Trc2
tRWD
tBSD
Tre
tCSD1
tRSD1