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HM5259165B Datenblatt(PDF) 12 Page - Elpida Memory

Teilenummer HM5259165B
Bauteilbeschribung  512M LVTTL interface SDRAM 133 MHz/100 MHz 8-Mword 횞 16-bit 횞 4-bank/16-Mword 횞 8-bit 횞 4-bank /32-Mword 횞 4-bit 횞 4-bank PC/133, PC/100 SDRAM
PDF  63 Pages
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Hersteller  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

HM5259165B Datenblatt(HTML) 12 Page - Elpida Memory

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HM5259165B/HM5259805B/HM5259405B-75/A6
Data Sheet E0118H10
12
DQM Truth Table (HM5259165B)
CKE
Command
Symbol
n - 1
n
DQMU
DQML
Upper byte (DQ8 to DQ15) write enable/output enable ENBU
H
×
L
×
Lower byte (DQ0 to DQ7) write enable/output enable
ENBL
H
××
L
Upper byte (DQ8 to DQ15) write inhibit/output disable MASKU
H
×
H
×
Lower byte (DQ0 to DQ7) write inhibit/output disable
MASKL
H
××
H
Note:
H: V
IH.
L: V
IL.
×: V
IH or VIL.
Write: I
DID is needed.
Read: I
DOD is needed.
DQM Truth Table (HM5259805B/HM5259405B)
CKE
Command
Symbol
n - 1
n
DQM
Write enable/output enable
ENB
H
×
L
Write inhibit/output disable
MASK
H
×
H
Note:
H: V
IH.
L: V
IL.
×: V
IH or VIL.
Write: I
DID is needed.
Read: I
DOD is needed.
The SDRAM can mask input/output data by means of DQM, DQMU/DQML.
DQMU masks the upper byte and DQML masks the lower byte. (HM5259165B)
During reading, the output buffer is set to Low-Z by setting DQM, DQMU/DQML to Low, enabling data
output. On the other hand, when DQM, DQMU/DQML is set to High, the output buffer becomes High-Z,
disabling data output.
During writing, data is written by setting DQM, DQMU/DQML to Low. When DQM, DQMU/DQML is set
to High, the previous data is held (the new data is not written). Desired data can be masked during burst read
or burst write by setting DQMU/DQML. For details, refer to the DQM, DQMU/DQML control section of the
SDRAM operating instructions.



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