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UPD48576209F1 Scheda tecnica(PDF) 30 Page - Renesas Technology Corp

Il numero della parte UPD48576209F1
Spiegazioni elettronici  576M-BIT Low Latency DRAM
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD48576209F1 Scheda tecnica(HTML) 30 Page - Renesas Technology Corp

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µµµµPD48576209F1, µµµµPD48576218F1, µµµµPD48576236F1
R10DS0256EJ0101 Rev. 1.01
Page 30 of 53
Jan. 15, 2016
2.12 Refresh Operation: AUTO REFRESH Command (AREF)
AREF is used to perform a REFRESH cycle on one row in a specific bank. The row addresses are generated by an
internal refresh counter; external address balls are “Don’t Care.” The delay between the AREF command and a
subsequent command to the same bank must be at least tRC.
Within a period of 32 ms (tREF), the entire memory must be refreshed. Figure 2-19 illustrates an example of a
continuous refresh sequence. Other refresh strategies, such as burst refresh, are also possible.
Figure 2-18. AUTO REFRESH Command
Remark BA: Bank address
Figure 2-19. AUTO REFRESH Cycle
Remarks 1.
ACx
: Any command on bank x
ARFx : Auto refresh bank x
ACy
: Any command on different bank.
2.
tRC is configuration-dependent. Refer to Table 2-4. Configuration Table.
CK#
CK
COMMAND
tRC
ARF
x
AC
y
AC
x
AC
y
Don't care
CK#
CK
WE#
REF#
CS#
ADDRESS
BANK
ADDRESS
BA
Don't care


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