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参数资料
| 型号： | V58C2256404SHUR5 |
| 厂商： | PROMOS TECHNOLOGIES INC |
| 元件分类： | DRAM |
| 英文描述： | 64M X 4 DDR DRAM, PBGA60 |
| 封装： | ROHS COMPLIANT, MO-233, FBGA-60 |
| 文件页数： | 5/60页 |
| 文件大小： | 1125K |
| 代理商： | V58C2256404SHUR5 |
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ProMOS TECHNOLOGIES
V58C2256(804/404/164)SH
V58C2256(804/404/164)SH Rev. 1.1 July 2010
Output Data (DQ) and Data Strobe (DQS) Timing Relative to the Clock (CK)
During Read Cycles
The minimum time during which the output data (DQ) is valid is critical for the receiving device (i.e., a mem-
ory controller device). This also applies to the data strobe during the read cycle since it is tightly coupled to
the output data. The minimum data output valid time (tDV) and minimum data strobe valid time (tDQSV) are de-
rived from the minimum clock high/low time minus a margin for variation in data access and hold time due to
DLL jitter and power supply noise.
Read Preamble and Postamble Operation
Prior to a burst of read data and given that the controller is not currently in burst read mode, the data strobe
signal (DQS), must transition from Hi-Z to a valid logic low. The is referred to as the data strobe “read pream-
ble” (tRPRE). This transition from Hi-Z to logic low nominally happens one clock cycle prior to the first edge of
valid data.
Once the burst of read data is concluded and given that no subsequent burst read operations are initiated,
the data strobe signal (DQS) transitions from a logic low level back to Hi-Z. This is referred to as the data
strobe “read postamble” (tRPST). This transition happens nominally one-half clock period after the last edge
of valid data.
Consecutive or “gapless” burst read operations are possible from the same DDR SDRAM device with no
requirement for a data strobe “read” preamble or postamble in between the groups of burst data. The data
strobe read preamble is required before the DDR device drives the first output data off chip. Similarly, the
data strobe postamble is initiated when the device stops driving DQ data at the termination of read burst cy-
cles.
(CAS Latency = 2.5; Burst Length = 4)
T0
T1
T2
T3
T4
NOP
D0
CK, CK
Command
DQS
DQ
D2
tDQSCK(max)
tDQSCK(min)
D1
tAC(min)
tAC(max)
D3
READ
NOP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| V58C2256804S | 制造商:MOSEL 制造商全称:MOSEL 功能描述:HIGH PERFORMANCE 2.5 VOLT 256 Mbit DDR SDRAM |
| V58C2256804SAT-5 | 制造商:Mosel Vitelic Corporation 功能描述:SDRAM, DDR, 32M x 8, 66 Pin, Plastic, TSSOP |
| V58C265164S | 制造商:MOSEL 制造商全称:MOSEL 功能描述:64 Mbit DDR SDRAM 2.5 VOLT 4M X 16 |
| V58C265404S | 制造商:MOSEL 制造商全称:MOSEL 功能描述:HIGH PERFORMANCE 2.5 VOLT 16M X 4 DDR SDRAM 4 BANKS X 4Mbit X 4 |
| V58C265804S | 制造商:MOSEL 制造商全称:MOSEL 功能描述:HIGH PERFORMANCE 2.5 VOLT 8M X 8 DDR SDRAM 4 BANKS X 2Mbit X 8 |
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