k4r881869m Samsung Semiconductor, Inc., k4r881869m Datasheet - Page 10

• Manufacturer Part Number: k4r881869m
• Description: 288mbit Rdram 512k X 18 Bit X 2*16 Dependent Banks Direct Rdramtm
• Manufacturer: Samsung Semiconductor, Inc.

K4R881869M
Field Encoding Summary
Table 6 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
Table 7 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
a. The DM (Device Match signal) value is determined by the DR4T,DR4F, DR3..DR0 field of the ROWA and ROWR packets. See Table 6.
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).
DR4T
1
0
1
0
DM
0
1
1
1
1
1
1
1
1
1
1
1
1
a
AV
-
1
0
0
0
0
0
0
0
0
0
0
0
DR4F
1
1
0
0
ROP10..ROP0 Field
10 9
-
Row address
1
0
1
x
x
x
x
x
0
0
0
-
1
0
0
x
x
x
x
x
0
0
0
8
-
0
0
1
0
0
0
x
x
0
0
0
Device Selection
All devices (broadcast)
One device selected
One device selected
No packet present
Table 6: Device Field Encodings for ROWA Packet and ROWR Packet
7
-
0
1
0
0
0
0
x
x
0
0
0
6
-
0
1
1
0
0
0
x
x
0
0
0
Table 7: ROWA Packet and ROWR Packet Field Encodings
5
-
x
0
0
0
1
1
x
x
0
0
0
c
4
-
x
0
0
1
0
1
x
x
0
0
0
3
-
x
x
x
x
x
x
0
1
x
x
0
2:0
---
000
000
000
000
000
000
000
000
001
010
000
Device Match signal (DM)
DM is set to 1
DM is set to 1 if {DEVID4..DEVID0} == {0,DR3..DR0} else DM is set to 0
DM is set to 1 if {DEVID4..DEVID0} == {1,DR3..DR0} else DM is set to 0
DM is set to 0
Name
-
ACT
PRER
REFA
REFP
PDNR
NAPR
NAPRC
ATTN
RLXR
TCAL
TCEN
NOROP
b
Command Description
No operation.
Activate row R8..R0 of bank BR4..BR0 of device and move device to ATTN
Precharge bank BR4..BR0 of this device.
Refresh (activate) row REFR8..REFR0 of bank BR3..BR0 of device.
Increment REFR if BR4..BR0 = 1111 (see Figure 50).
Precharge bank BR4..BR0 of this device after REFA (see Figure 50).
Move this device into the powerdown (PDN) power state (see Figure 47).
Move this device into the nap (NAP) power state (see Figure 47).
Move this device into the nap (NAP) power state conditionally
Move this device into the attention (ATTN) power state (see Figure 45).
Move this device into the standby (STBY) power state (see Figure 46).
Temperature calibrate this device (see Figure 52).
Temperature calibrate/enable this device (see Figure 52).
No operation.
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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.
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 38. 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 43.
Preliminary
Direct RDRAM
Rev. 0.9 Jan. 2000
b
.
™