Page 8

K4R271669B/K4R441869B

Version 1.11 Oct. 2000

Field Encoding Summary

Table 5 shows how the six device address bits are decoded

for the ROWA and ROWR packets. The DR4T and DR4F

encoding merges a fifth device bit with a framing bit. When

neither bit is asserted, the device is not selected. Note that a

broadcast operation is indicated when both bits are set.

Broadcast operation would typically be used for refresh and

power management commands. If the device is selected, the

DM (DeviceMatch) signal is asserted and an ACT or ROP

command is performed.

Table 6 shows the encodings of the remaining fields of the

ROWA and ROWR packets. An ROWA packet is specified

by asserting the AV bit. This causes the specified row of the

specified bank of this device to be loaded into the associated

sense amps.

An ROWR packet is specified when AV is not asserted. An

11 bit opcode field encodes a command for one of the banks

of this device. The PRER command causes a bank and its

two associated sense amps to precharge, so another row or

an adjacent bank may be activated. The REFA (refresh-acti-

vate) command is similar to the ACT command, except the

row address comes from an internal register REFR, and

REFR is incremented at the largest bank address. The REFP

(refresh-precharge) command is identical to a PRER

command.

The NAPR, NAPRC, PDNR, ATTN, and RLXR commands

are used for managing the power dissipation of the RDRAM

and are described in more detail in “Power State Manage-

ment” on page 50. The TCEN and TCAL commands are

used to adjust the output driver slew rate and they are

described in more detail in “Current and Temperature

Control” on page 56.

Table 5: Device Field Encodings for ROWA Packet and ROWR Packet

DR4T

DR4F

Device Selection

Device Match signal (DM)

1

1

All devices (broadcast)

DM is set to 1

0

1

One device selected

DM is set to 1 if {DEVID4..DEVID0} == {0,DR3..DR0} else DM is set to 0

1

0

One device selected

DM is set to 1 if {DEVID4..DEVID0} == {1,DR3..DR0} else DM is set to 0

0

0

No packet present

DM is set to 0

Table 6: ROWA Packet and ROWR Packet Field Encodings

AV

ROP10..ROP0 Field

Name

Command Description

10

9

8

7

6

5

4

3

2:0

0

-

-

-

-

-

-

-

-

-

---

-

No operation.

1

1

Row address

ACT

1

0

1

1

0

0

0

x

x

000

PRER

Precharge bank BR4..BR0 of this device.

1

0

0

0

0

1

1

0

0

x

000

REFA

Refresh (activate) row REFR8..REFR0 of bank BR4..BR0 of device.

Increment REFR if BR4..BR0 = 11111 (see Figure 51).

1

0

1

0

1

0

1

0

0

x

000

REFP

Precharge bank BR4..BR0 of this device after REFA (see Figure 51).

1

0

x

x

0

0

0

0

1

x

000

PDNR

Move this device into the powerdown (PDN) power state (see Figure 48).

1

0

x

x

0

0

0

1

0

x

000

NAPR

Move this device into the nap (NAP) power state (see Figure 48).

1

0

x

x

0

0

0

1

1

x

000

NAPRC

Move this device into the nap (NAP) power state conditionally

1

0

x

x

x

x

x

x

x

0

000

Move this device into the attention (ATTN) power state (see Figure 46).

1

0

x

x

x

x

x

x

x

1

000

RLXR

Move this device into the standby (STBY) power state (see Figure 47).

1

0

0

0

0

0

0

0

0

x

001

TCAL

Temperature calibrate this device (see Figure 54).

1

0

0

0

0

0

0

0

0

x

010

TCEN

Temperature calibrate/enable this device (see Figure 54).

1

0

0

0

0

0

0

0

0

0

000

NOROP

No operation.

a. The DM (Device Match signal) value is determined by the DR4T,DR4F, DR3..DR0 field of the ROWA and ROWR packets. See Table 5.

b. The ATTN command does not cause a RLX-to-ATTN transition for a broadcast operation (DR4T/DR4F=1/1).

c. An “x” entry indicates which commands may be combined. For instance, the three commands PRER/NAPRC/RLXR may be specified in one ROP value (011000111000).