Page 9

K4R271669F

Version 1.41 Jan. 2004

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.

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.

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

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 56), and for the RLXX power

mode command (see “Power State Management” on page

50).

Table 7: COLC Packet Field Encodings

S

DC4.. DC0

COP3..0

Name

Command Description

0

----

-----

-

No operation.

1

/= (DEVID4 ..0)

-----

-

Retire write buffer of this device.

1

== (DEVID4 ..0)

NOCOP

Retire write buffer of this device.

1

== (DEVID4 ..0)

x001

WR

Retire write buffer of this device, then write column C5..C0 of bank BC4..BC0 to write buffer.

1

== (DEVID4 ..0)

x010

RSRV

Reserved, no operation.

1

== (DEVID4 ..0)

x011

RD

Read column C5..C0 of bank BC4..BC0 of this device.

1

== (DEVID4 ..0)

x100

PREC

Retire write buffer of this device, then precharge bank BC4..BC0 (see Figure 15).

1

== (DEVID4 ..0)

x101

WRA

Same as WR, but precharge bank BC4..BC0 after write buffer (with new data) is retired.

1

== (DEVID4 ..0)

x110

RSRV

Reserved, no operation.

1

== (DEVID4 ..0)

x111

RDA

Same as RD, but precharge bank BC4..BC0 afterward.

1

== (DEVID4 ..0)

1xxx

RLXC

Move this device into the standby (STBY) power state (see Figure 48).

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: COLM Packet and COLX Packet Field Encodings

M

DX4 .. DX0

(selects device)

XOP4..0

Name

Command Description

1

----

-

MSK

MB/MA bytemasks used by WR/WRA.

0

/= (DEVID4 ..0)

-

-

No operation.

0

== (DEVID4 ..0)

00000

NOXOP

No operation.

0

== (DEVID4 ..0)

PREX

Precharge bank BX4..BX0 of this device (see Figure 15).

0

== (DEVID4 ..0)

x10x0

CAL

0

== (DEVID4 ..0)

x11x0

CAL/SAM

0

== (DEVID4 ..0)

xxx10

RLXX

Move this device into the standby (STBY) power state (see Figure 48).

0

== (DEVID4 ..0)

xxxx1

RSRV

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).