參數(shù)資料
型號: LR4500
廠商: LSI Corporation
英文描述: Superscalar Microprocessor(超標量微處理器)
中文描述: 超標量微處理器(超標量微處理器)
文件頁數(shù): 95/172頁
文件大?。?/td> 1142K
代理商: LR4500
6-1
Chapter 6
DRAM Controller and
Memory Bus
This chapter describes the synchronous DRAM Controller and the
memory bus. It defines:
DRAM types compatible with the LR4500 on
page 6-1
Address space available for the DRAM on
page 6-1
Memory interface on
page 6-2
Memory address bit assignment on
page 6-4
DRAM Controller Configuration Register on
page 6-5
DRAM Mode Register on
page 6-10
DRAM refresh requirements, and the DRAM Controller Refresh
Register and Refresh counter on
page 6-12
DRAM commands on
page 6-14
Initializing the DRAM on
page 6-15
6.1 DRAM Types and Available DRAM Address Area
The LR4500 Microprocessor reference device interfaces directly to
synchronous DRAMs, without any glue logic, through a 64-bit memory
data bus. When the DRAM is arranged in two banks, the chip select
signals, MCSn[1:0], select between the two banks.
Table 6.1
shows different DRAM configurations and the address ranges
assigned to the memory banks. There is no programmable feature that
defines the DRAM size and configuration. The utility setup/bootstrap
相關(guān)PDF資料
PDF描述
LRC1220LTC750.025R Fractional Ohm
LRC Fractional Ohm
LRC1220H Fractional Ohm
LRC1220HTC1000.025R Fractional Ohm
LRC1220HTC1000.05R Fractional Ohm
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LR4-550 功能描述:可復位保險絲 5.5A 20V 100A Imax RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C
LR4-550F 功能描述:可復位保險絲 5.5A 20V 100A Imax RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C
LR4-550R 功能描述:可復位保險絲 RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C
LR4-550R-2 功能描述:可復位保險絲 LR4-550R-2 RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C
LR4-550RAF 功能描述:可復位保險絲 5.5A STRAP Polyswitch PTC RESET RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C