km416rd8ac Samsung Semiconductor, Inc., km416rd8ac Datasheet - Page 12

• Manufacturer Part Number: km416rd8ac
• Description: 128/144mbit Rdram 256k X 16/18 Bit X 2*16 Dependent Banks Direct Rdramtm
• Manufacturer: Samsung Semiconductor, Inc.

KM416RD8AC(D)/KM418RD8AC(D)
Table 8 shows the COP field encoding. The device must be
in the ATTN power state in order to receive COLC packets.
The COLC packet is used primarily to specify RD (read) and
WR (write) commands. Retire operations (moving data from
the write buffer to a sense amp) happen automatically. See
Figure 17 for a more detailed description.
a.
b. An
Table 9 shows the COLM and COLX field encodings. The
M bit is asserted to specify a COLM packet with two 8 bit
bytemask fields MA and MB. If the M bit is not asserted, an
COLX is specified. It has device and bank address fields,
and an opcode field. The primary use of the COLX packet is
to permit an independent PREX (precharge) command to be
a. An
S
0
1
1
1
1
1
1
1
1
1
1
M
1
0
0
0
0
0
0
0
“
/=
“
“
“
x
x
“
means not equal,
DC4.. DC0
(select device)
----
/= (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
DX4 .. DX0
(selects device)
----
/= (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
“
entry indicates which commands may be combined. For instance, the two commands PREX/RLXX may be specified in one XOP value (10010).
entry indicates which commands may be combined. For instance, the two commands WR/RLXC may be specified in one COP value(1001).
“
==
a
“
means equal.
COP3..0 Name
-----
-----
x000
x001
x010
x011
x100
x101
x110
x111
1xxx
XOP4..0
-
-
00000
1xxx0
x10x0
x11x0
xxx10
xxxx1
b
a
Table 9: COLM Packet and COLX Packet Field Encodings
-
-
NOCOP
WR
RSRV
RD
PREC
WRA
RSRV
RDA
RLXC
Name
MSK
-
NOXOP
PREX
CAL
CAL/SAM
RLXX
RSRV
Command Description
No operation.
Retire write buffer of this device.
Retire write buffer of this device.
Retire write buffer of this device, then write column C5..C0 of bank BC4..BC0 to write buffer.
Reserved, no operation.
Read column C5..C0 of bank BC4..BC0 of this device.
Retire write buffer of this device, then precharge bank BC4..BC0 (see Figure 14).
Same as WR, but precharge bank BC4..BC0 after write buffer (with new data) is retired.
Reserved, no operation.
Same as RD, but precharge bank BC4..BC0 afterward.
Move this device into the standby (STBY) power state (see Figure 46).
Table 8: COLC Packet Field Encodings
Command Description
MB/MA bytemasks used by WR/WRA.
No operation.
No operation.
Precharge bank BX4..BX0 of this device (see Figure 14).
Calibrate (drive) I
Calibrate (drive) and Sample ( update) I
Move this device into the standby (STBY) power state (see Figure 46).
Reserved, no operation.
Page 9
OL
The COLC packet can also specify a PREC command,
which precharges a bank and its associated sense amps. The
RDA/WRA commands are equivalent to combining RD/WR
with a PREC. RLXC (relax) performs a power mode transi-
tion. See
specified without consuming control bandwidth on the ROW
pins. It is also used for the CAL(calibrate) and SAM
(sample) current control commands (see
Temperature Control
mode command (see
38).
current for this device (see Figure 51).
“
Power State Management
OL
current for this device (see Figure 51).
“
“
Power State Management
on page 43), and for the RLXX power
Rev. 1.01 Oct. 1999
Direct RDRAM
“
on page 38.
“
Current and
“
on page
™