- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379500 > UPD488448FB-C60-53-DQ2 (NEC Corp.) 128 M-bit Direct Rambus⑩ DRAM PDF資料下載
參數(shù)資料
| 型號： | UPD488448FB-C60-53-DQ2 |
| 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)： | 11/80頁 |
| 文件大?。?/td> | 1902K |
| 代理商： | UPD488448FB-C60-53-DQ2 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁
Data Sheet M14837EJ3V0DS00
11
μ
PD488448 for Rev. P
2. Packet Format
Figure 2-1 shows the formats of the ROWA and ROWR packets on the ROW pins. Table 2-1 describes the fields
which comprise these packets. DR4T and DR4F bits are encoded to contain both the DR4 device address bit and a
framing bit which allows the ROWA or ROWR packet to be recognized by the RDRAM.
The AV (ROWA/ROWR packet selection) bit distinguishes between the two packet types. Both the ROWA and
ROWR packet provide a five bit device address and a four bit bank address. An ROWA packet uses the remaining
bits to specify a nine bit row address, and the ROWR packet uses the remaining bits for an eleven bit opcode field.
Note the use of the “RsvX” notation to reserve bits for future address field extension.
Figure 2-1 also shows the formats of the COLC, COLM, and COLX packets on the COL pins. Table 2-2 describes
the fields which comprise these packets.
The COLC packet uses the S (Start) bit for framing. A COLM or COLX packet is aligned with this COLC packet, and
is also framed by the S bit.
The 23 bit COLC packet has a five bit device address, a four bit bank address, a six bit column address, and a four
bit opcode. The COLC packet specifies a read or write command, as well as some power management commands.
The remaining 17 bits are interpreted as a COLM (M=1) or COLX (M=0) packet. A COLM packet is used for a
COLC write command which needs bytemask control. The COLM packet is associated with the COLC packet from a
time t
RTR
earlier. An COLX packet may be used to specify an independent precharge command. It contains a five bit
device address, a four bit bank address, and a five bit opcode. The COLX packet may also be used to specify some
housekeeping and power management commands. The COLX packet is framed within a COLC packet but is not
otherwise associated with any other packet.
Table 2-1 Field Description for ROWA Packet and ROWR Packet
Field
Description
DR4T, DR4F
Bits for framing (recognizing) a ROWA or ROWR packet. Also encodes highest device address bit.
DR3..DR0
Device address for ROWA or ROWR packet.
BR4..BR0
Bank address for ROWA or ROWR packet. RsvB denotes bits ignored by the RDRAM.
AV
Selects between ROWA packet (AV=1) and ROWR packet (AV=0).
R8..R0
Row address for ROWA packet. RsvR denotes bits reserved for future row address extension.
ROP10..ROP0
Opcode field for ROWR packet. Specifies precharge, refresh, and power management functions.
Table 2-2 Field Description for COLC Packet, COLM Packet, and COLX Packet
Field
Description
S
Bit for framing (recognizing) a COLC packet, and indirectly for framing COLM and COLX packets.
DC4..DC0
Device address for COLC packet.
BC4..BC0
Bank address for COLC packet. RsvB denotes bits reserved for future extension (controller drivers 0's).
C5..C0
Column address for COLC packet. RsvC denotes bits ignored by the RDRAM.
COP3..COP0
Opcode field for COLC packet. Specifies read, write, precharge, and power management functions.
M
Selects between COLM packet (M=1) and COLX packet (M=0).
MA7..MA0
Bytemask write control bits. 1=write, 0=no-write. MA0 controls the earliest byte on DQA7..0.
MB7..MB0
Bytemask write control bits. 1=write, 0=no-write. MB0 controls the earliest byte on DQB7..0.
DX4..DX0
Device address for COLX packet.
BX4..BX0
Bank address for COLX packet. RsvB denotes bits reserved for future extension (controller drivers 0's).
XOP4..XOP0
Opcode field for COLX packet. Specifies precharge, I
OL
control, and power management functions.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD488448FF-C80-45-DQ1 | 128 M-bit Direct Rambus⑩ DRAM |
| UPD488448FF-C80-45-DQ2 | 128 M-bit Direct Rambus⑩ DRAM |
| UPD61051 | MOS INTEGRATED CIRCUIT MPEG2 AUDIO/VIDEO ENCODER |
| UPD61051GD-LML | MOS INTEGRATED CIRCUIT MPEG2 AUDIO/VIDEO ENCODER |
| UPD61051GD-LML-A | MOS INTEGRATED CIRCUIT MPEG2 AUDIO/VIDEO ENCODER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD4990AG-A | 制造商:Renesas Electronics 功能描述:Cut Tape |
| UPD4991ACX-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD4992CX-A | 制造商:Renesas Electronics 功能描述:Cut Tape |
| UPD50256CP15 | 制造商:HIT 功能描述:50256 HITACHI'86 SMT N9F8A |
| UPD50256CP-15 | 制造商:HIT 功能描述:50256 HITACHI'86 SMT N9F8A |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。