hm5216805 Renesas Electronics Corporation., hm5216805 Datasheet - Page 23

• Manufacturer Part Number: hm5216805
• Description: 16 M Lvttl Interface Sdram 100 Mhz/83 Mhz 1-mword 8-bit 2-bank/2-mword 4-bit 2-bank - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Burst Length
Write operation: Burst write or single write mode is selected by the OPCODE (A11, A10, A9, A8) of the
mode register.
Burst write: A burst write operation is enabled by setting OPCODE (A9, A8) to (0, 0). A burst write
starts in the same cycle as a write command set. (The latency of data input is 0.) The burst length can be
set to 1, 2, 4 or 8 and full-page, like burst read operations. The write start address is specified by the
column address (AY0 to AY8; HM5216805 Series, AY0 to AY9; HM5216405 Series) and the bank select
address (A11) at the write command set cycle.
Command
Command
Address
Dout
Address
Din
CLK
CLK
BL = 1
BL = 2
BL = 4
BL = 8
BL = full page
BL = 1
BL = 2
BL = 4
BL = 8
BL = full page
ACTV
Row
ACTV
Row
t
RCD
t
RCD
Column
READ
Column
WRIT
in 0
in 0
in 0
in 0
in 0
in 1
in 1
in 1
in 1
out 0
out 0 out 1
out 0 out 1 out 2 out 3
out 0 out 1 out 2 out 3
out 0 out 1 out 2 out 3
in 2
in 2
in 2
in 3
in 3
in 3
in 4
in 4
HM5216805 Series, HM5216405 Series
in 5
in 5
out 4 out 5
out 4 out 5
in 6
in 6
out 6 out 7
out 6 out 7
in 7
in 7
in 8
out 8
in 255
out 255
CAS Latency = 1, 2, 3
in 0
out 0 out 1
BL: Burst Length
CAS Latency = 2
in 1
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