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參數(shù)資料
| 型號： | UPD488448FB-C80-45-DQ1 |
| 廠商： | NEC Corp. |
| 英文描述： | 128 M-bit Direct Rambus⑩ DRAM |
| 中文描述： | 128 M位DRAM的直接Rambus的⑩ |
| 文件頁數(shù)： | 13/80頁 |
| 文件大小： | 1902K |
| 代理商： | UPD488448FB-C80-45-DQ1 |
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Data Sheet M14837EJ3V0DS00
13
μ
PD488448 for Rev. P
3. Field Encoding Summary
Table 3-1 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 3-1 Device Field Encodings for ROWA Packet and ROWR Packet
DR4T
DR4F
Device Selection
Device Match signal (DM)
1
0
1
0
1
1
0
0
All devices (broadcast)
One device selected
One device selected
No packet present
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
Table 3-2 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-activate) 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 “
23. Power State Management
”. The TCEN and TCAL commands are
used to adjust the output driver slew rate and they are described in more detail in “
25. Current and Temperature
Control
”.
Table 3-2 ROWA Packet and ROWR Packet Field Encodings
DM
AV
ROP10..ROP0 Field
8
7
6
Name
Command Description
Note1
10
9
5
4
3
2 :
0
0
1
—
1
— — — — —
Row address
—
— —
---
—
ACT
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 BR4..BR0 of device.
Increment REFR if BR4..BR0=11111 (see Figure 24-1).
Precharge bank BR4..BR0 of this device after REFA (see Figure 24-1).
Move this device into the powerdown (PDN) power state (see figure 23-3).
Move this device into the nap (NAP) power state (see Figure 23-3).
Move this device into the nap (NAP) power state conditionally.
Move this device into the attention (ATTN) power state (see Figure 23-1).
Move this device into the standby (STBY) power state (see Figure 23-2).
Temperature calibrate this device (see figure 25-2).
Temperature calibrate/enable this device (see Figure 25-2).
No operation.
Note2
.
1
1
0
0
1
0
1
0
0
0
0
1
0
1
x
Note3
x
0
x
x
000 PRER
000 REFA
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
x
x
x
x
x
0
0
0
0
x
x
x
x
x
0
0
0
1
0
0
0
x
x
0
0
0
0
0
0
0
x
x
0
0
0
1
0
0
0
x
x
0
0
0
0
0
1
1
x
x
0
0
0
0
1
0
1
x
x
0
0
0
x
x
x
x
0
1
x
x
0
000 REFP
000 PDNR
000 NAPR
000 NAPRC
000 ATTN
000 RLXR
001 TCAL
010 TCEN
000 NOROP
Note2
Notes 1.
The DM (Device Match signal) value is determined by the DR4T, DR4F, DR3..DR0 field of the ROWA and ROWR packets.
See Table 3-1.
2.
The ATTN command does not cause a RLX-to-ATTN transition for a broadcast operation (RD4T/DR4F=1/1).
3.
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).
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