參數(shù)資料
型號(hào)： KM416RD4C
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Direct Rambus DRAM(Direct Rambus 動(dòng)態(tài)RAM)
中文描述： 直接Rambus公司的DRAM（動(dòng)態(tài)內(nèi)存直接Rambus公司）
文件頁(yè)數(shù)： 38/59頁(yè)
文件大小： 4654K
代理商： KM416RD4C
Page 39
KM416RD4C/KM418RD4C
Direct RDRAM
Revision 0.2 September 1998
TARGET
Power State Management
Table Table summarizes the power states available to a
Direct RDRAM. In general, the lowest power states have the
longest operational latencies. For example, the relative
power levels of PDN state and STBY state have a ratio of
about 1:110, and the relative access latencies to get read data
have a ratio of about 250:1.
PDN state is the lowest power state available. The informa-
tion in the RDRAM core is usually maintained with self-
refresh; an internal timer automatically refreshes all rows of
all banks. PDN has a relatively long exit latency because the
TCLK/RCLK block must resynchronize itself to the external
clock signal.
NAP state is another low-power state in which either self-
refresh or REFA-refresh are used to maintain the core. See
“Refresh” on page 43 for a description of the two refresh
mechanisms. NAP has a shorter exit latency than PDN
because the TCLK/RCLK block maintains its synchroniza-
tion state relative to the external clock signal at the time of
NAP entry. This imposes a limit (t
NLIMIT
) on how long an
RDRAM may remain in NAP state before briefly returning
to STBY or ATTN to update this synchronization state.
Figure Figure summarizes the transition conditions needed
for moving between the various power states. Note that NAP
and PDN have been divided into two substates (NAP-A/
NAP-S and PDN-A/PDN-S) to account for the fact that a
NAP or PDN exit may be made to either ATTN or STBY
states.
At initialization, the SETR/CLRR Reset sequence will put
the RDRAM into PDN-S state. The PDN exit sequence
involves an optional PDEV specification and bits on the
CMD and SIO
IN
pins.
Once the RDRAM is in STBY, it will move to the ATTN/
ATTNR/ATTNW states when it receives a non-broadcast
ROWA packet or non-broadcast ROWR packet with the
ATTN command. The RDRAM returns to STBY from these
three states when it receives a RLX command. Alternatively,
it may enter NAP or PDN state from ATTN or STBY states
with a NAPR or PDNR command in an ROWR packet. The
PDN or NAP exit sequence involves an optional PDEV spec-
ification and bits on the CMD and SIO0 pins. The RDRAM
returns to the ATTN or STBY state it was originally in when
it first entered NAP or PDN.
An RDRAM may only remain in NAP state for a time
t
NLIMIT
. It must periodically return to ATTN or STBY.
The NAPRC command causes a napdown operation if the
RDRAM’s NCBIT is set. The NCBIT is not directly visible.
It is undefined on reset. It is set by a NAP or NAPRC
command to the RDRAM, and it is cleared by an ACT
command to the RDRAM. It permits a controller to manage a
set of RDRAMs in a mixture of power states.
STBY state is the normal idle state of the RDRAM. In this
state all banks and sense amps have usually been left
precharged and ROWA and ROWR packets on the ROW
pins are being monitored. When a non-broadcast ROWA
packet or non-broadcast ROWR packet (with the ATTN
command) packet addressed to the RDRAM is seen, the
RDRAM enters ATTN state (see the right side of
Figure Figure). This requires a time t
SA
during which the
RDRAM activates the specified row of the specified bank. A
time TFRMt
CYCLE
after the ROW packet, the RDRAM will
be
Table 17 : Power State Summary
Power
State
Description
Blocks consuming power
Power
State
Description
Blocks consuming power
PDN
Powerdown state.
Self-refresh
NAP
Nap state. Similar to PDN
except lower wake-up
latency.
Self-refresh or
REFA-refresh
TCLK/RCLK-Nap
STBY
Standby state.
Ready for ROW
packets.
REFA-refresh
TCLK/RCLK
ROW demux receiver
ATTN
Attention state.
Ready for ROW and COL
packets.
REFA-refresh
TCLK/RCLK
ROW demux receiver
COL demux receiver
ATTNR
Attention read state.
Ready for ROW and COL
packets.
Sending Q (read data)
packets.
REFA-refresh
TCLK/RCLK
ROW demux receiver
COL demux receiver
DQ mux transmitter
Core power
ATTNW
Attention write state.
Ready for ROW and COL
packets.
Ready for D (write data)
packets.
REFA-refresh
TCLK/RCLK
ROW demux receiver
COL demux receiver
DQ demux receiver
Core power
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