k4r881869e Samsung Semiconductor, Inc., k4r881869e Datasheet - Page 11

• Manufacturer Part Number: k4r881869e
• Description: 288mbit Rdram 512k X 18bit X 32s Banks
• Manufacturer: Samsung Semiconductor, Inc.

K4R881869E
Table 7 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 18 for a more detailed description.
a. “/=” means not equal, “==” means equal.
b. An “x” entry indicates which commands may be combined. For instance, the two commands WR/RLXC may be specified in one COP value (1001).
Table 8 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 “x” entry indicates which commands may be combined. For instance, the two commands PREX/RLXX may be specified in one XOP value (10010).
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
M
S
----
/= (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
----
/= (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
== (DEVID4 ..0)
(select device)
(selects device)
DX4 .. DX0
DC4.. DC0
a
-----
-----
x000
x001
x010
x011
x100
x101
x110
x111
1xxx
-
-
00000
1xxx0
x10x0
x11x0
xxx10
xxxx1
COP3..0
XOP4..0
b
a
Table 8: COLM Packet and COLX Packet Field Encodings
-
-
WR
RSRV
RD
PREC
WRA
RSRV
RDA
RLXC
NOCOP
Name
MSK
-
NOXOP
PREX
CAL
CAL/SAM
RLXX
RSRV
Name
No operation.
Retire write buffer of this device.
Retire write buffer of this device.
Retire write buffer of this device, then write column C6..C0 of bank BC4..BC0 to write buffer.
Reserved, no operation.
Read column C6..C0 of bank BC4..BC0 of this device.
Retire write buffer of this device, then precharge bank BC4..BC0 (see Figure 15).
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 48).
Table 7: COLC Packet Field Encodings
MB/MA bytemasks used by WR/WRA.
No operation.
No operation.
Precharge bank BX3..BX0 of this device (see Figure 15).
Calibrate (drive) I
Calibrate (drive) and Sample ( update) I
Move this device into the standby (STBY) power state (see Figure 48).
Reserved, no operation.
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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 “Power State Management” on page 50.
specified without consuming control bandwidth on the ROW
pins. It is also used for the CAL(calibrate) and SAM (sam-
ple) current control commands (see “Current and Tempera-
ture Control” on page 56), and for the RLXX power mode
command (see “Power State Management” on page 50).
current for this device (see Figure 54).
Command Description
Command Description
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current for this device (see Figure 54).
Version 1.4 Dec. 2003
Direct RDRAM
™