K4R881869M Datasheet, PDF (11/64 Pages) Samsung semiconductor – 288Mbit RDRAM 512K x 18 bit x 2*16 Dependent Banks Direct RDRAMTM

K4R881869M
Preliminary
Direct RDRAM^™
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.
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 38.
Table 8: COLC Packet Field Encodings
S DC4.. DC0
(select device)^a
0 ----
1 /= (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
1 == (DEVID4 ..0)
COP3..0 Name Command Description
-----
-----
x000^b
x001
x010
x011
x100
x101
x110
x111
1xxx
-
No operation.
-
Retire write buffer of this device.
NOCOP Retire write buffer of this device.
WR
Retire write buffer of this device, then write column C6..C0 of bank BC4..BC0 to write buffer.
RSRV Reserved, no operation.
RD
Read column C6..C0 of bank BC4..BC0 of this device.
PREC Retire write buffer of this device, then precharge bank BC4..BC0 (see Figure 14).
WRA Same as WR, but precharge bank BC4..BC0 after write buffer (with new data) is retired.
RSRV Reserved, no operation.
RDA Same as RD, but precharge bank BC4..BC0 afterward.
RLXC Move this device into the standby (STBY) power state (see Figure 46).
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 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
specified without consuming control bandwidth on the ROW
pins. It is also used for the CAL(calibrate) and SAM
(sample) current control commands (see “Current and
Temperature Control” on page 43, and for the RLXX power
mode command (see “Power State Management” on page
38).
Table 9: COLM Packet and COLX Packet Field Encodings
M
DX4 .. DX0
(selects device)
1 ----
0 /= (DEVID4 ..0)
0 == (DEVID4 ..0)
0 == (DEVID4 ..0)
0 == (DEVID4 ..0)
0 == (DEVID4 ..0)
0 == (DEVID4 ..0)
0 == (DEVID4 ..0)
XOP4..0
-
-
00000
1xxx0^a
x10x0
x11x0
xxx10
xxxx1
Name
MSK
-
NOXOP
PREX
CAL
CAL/SAM
RLXX
RSRV
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_OL current for this device (see Figure 51).
Calibrate (drive) and Sample ( update) I_OL current for this device (see Figure 51).
Move this device into the standby (STBY) power state (see Figure 46).
Reserved, no operation.
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)
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Rev. 0.9 Jan. 2000