Datasheet

Command Address Latency
Command Address Latency (CAL) is a power savings feature and can be enabled or disabled via the MRS
setting. CAL is defined as the delay in clock cycles (t
CAL
) between a CS# registered LOW and its corresponding
registered command and address. The value of CAL (in clocks) must be programmed into the mode register
and is based on the roundup (in clocks) of [t
CK
(ns)/t
CAL
(ns)].
Internal VREF Monitor
The device generates its own internal V
REFDQ
. This mode may be enabled during V
REFDQ
training, and when
enabled, VREF, time-short and VREF, time-long need to be increased by 10ns if DQ0, DQ1, DQ2, or DQ3 have 0pF
loading. An additional 15ns per pF of loading is also needed.
Maximum Power Savings Mode
This mode provides the lowest power mode where data retention is not required. When the device is in the
maximum power saving mode, it does not need to guarantee data retention or respond to any external
command (except the maximum power saving mode exit command and during the assertion of Reset# signal
LOW).
AS4C512M8D4
Confidential
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Rev.1.0. Aug.2019