KM416RD8ACD-RK80 datasheet(12/64 Pages) SAMSUNG

12 / 64 page

Page 9

KM416RD8AC(D)/KM418RD8AC(D)

Direct RDRAM™

Rev. 1.01 Oct. 1999

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 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 8: COLC Packet Field Encodings

DC4.. DC0

(select device)a

COP3..0 Name

Command Description

----

-----

No operation.

/= (DEVID4 ..0)

-----

Retire write buffer of this device.

== (DEVID4 ..0)

x000b

NOCOP

Retire write buffer of this device.

== (DEVID4 ..0)

x001

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

== (DEVID4 ..0)

x010

RSRV

Reserved, no operation.

== (DEVID4 ..0)

x011

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

== (DEVID4 ..0)

x100

PREC

Retire write buffer of this device, then precharge bank BC4..BC0 (see Figure 14).

== (DEVID4 ..0)

x101

WRA

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

== (DEVID4 ..0)

x110

RSRV

Reserved, no operation.

== (DEVID4 ..0)

x111

RDA

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

== (DEVID4 ..0)

1xxx

RLXC

Move this device into the standby (STBY) power state (see Figure 46).

“ /= “ 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: COLM Packet and COLX Packet Field Encodings

DX4 .. DX0

(selects device)

XOP4..0

Name

Command Description

----

MSK

MB/MA bytemasks used by WR/WRA.

/= (DEVID4 ..0)

No operation.

== (DEVID4 ..0)

00000

NOXOP

No operation.

== (DEVID4 ..0)

1xxx0a

PREX

Precharge bank BX4..BX0 of this device (see Figure 14).

== (DEVID4 ..0)

x10x0

CAL

Calibrate (drive) IOL current for this device (see Figure 51).

== (DEVID4 ..0)

x11x0

CAL/SAM

Calibrate (drive) and Sample ( update) IOL current for this device (see Figure 51).

== (DEVID4 ..0)

xxx10

RLXX

Move this device into the standby (STBY) power state (see Figure 46).

== (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).

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