PD488588FF datasheet(13/79 Pages) ELPIDA

13 / 79 page

Data Sheet

E0251N20 (Ver. 2.0)

µµµµPD488588FF-C80-40

Table 3-3 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 15-1 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 a combining RD/WR with a PREC. RLXC (relax) performs a power mode

transition. See 23. Power State Management.

Table 3-3 COLC Packet Field Encodings

DC4..DC0

(select device)

Note1

COP3..0

Name

Command Description

- - - -

- - - - -

—

No operation.

/= (DEVID4..0)

- - - - -

—

Retire write buffer of this device.

== (DEVID4..0)

x000

Note2

NOCOP

Retire write buffer of this device.

== (DEVID4..0)

x001

Retire write buffer of this device, then write column C6..C0 of bank

BC4..BC0 to write buffer.

== (DEVID4..0)

x010

RSRV

Reserved, no operation.

== (DEVID4..0)

x011

Read column C6..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 12-2).

== (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 23-2).

Notes 1. “/=” means not equal, “==” means equal.

2. 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 3-4 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 25. Current and Temperature Control), and for the

RLXX power mode command (see 23. Power State Management).

Table 3-4 COLM Packet and COLX Packet Field Encodings

DX4..DX0

(select 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)

1xxx0

Note

PREX

Precharge bank BX4..BX0 of this device (see Figure 12-2).

== (DEVID4..0)

x10x0

CAL

Calibrate (drive) IOL current for this device (see Figure 25-1).

== (DEVID4..0)

x11x0

CAL / SAM Calibrate (drive) and Sample (update) IOL current for this device (see Figure 25-1).

== (DEVID4..0)

xxx10

RLXX

Move this device into the standby (STBY) power state (see Figure 23-2).

== (DEVID4..0)

xxxx1

RSRV

Reserved, no operation.

Note 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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