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.
AS4C256M16D4
Confidential
- 23 of 201 -
Rev.1.0 Aug.2019