参数资料
型号: IDT72T6360L6BBGI
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 微控制器/微处理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PBGA324
封装: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-324
文件页数: 10/51页
文件大小: 508K
代理商: IDT72T6360L6BBGI
18
IDT72T6360 2.5V, SEQUENTIAL FLOW-CONTROL DEVICE
x9, x18, x36 BIT WIDE CONFIGURATION
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
OCTOBER 10, 2005
TOTAL AVAILABLE MEMORY USAGE
The sequential flow-control (SFC) is designed to efficiently use as much of
theDDRSDRAMmemoryaspossible,butduetothediscontinuitybetweenthe
SFC bus width (x36) and the DDR SDRAM interface (x16 or x32), some
columns in a row of the SDRAM will not be used. As a result, the total usable
memorywillbeslightlylessthanthetotalavailablememoryintheSDRAM.Table
5 outlines the total usable memory for the various configurations depending on
whether or not the Error Detection and Correction (EDC) feature is selected.
If the EDC feature is selected, 8 syndrome bits will be generated per every 64
bits of data. Therefore every third write burst to the SDRAM will send out the
8 syndrome bits, resulting in 24 unused bits inthe column. Therefore, using the
EDCfeature,therewillbesignificantlylessusablememoryofdatastorage.The
EDC function is described in the Error Detection and Correction section of this
datasheet.
Total DDR SDRAM
Total Usable
Density
Memory (EDC off)
Memory (EDC on)
Configuration 1
1 x [4Mb x 32]
128Mb
108Mb
72Mb
1 x [8Mb x 32]
256Mb
252Mb
144Mb
Configuration 2
1 x [8Mb x 16]
128Mb
108Mb
72Mb
1 x [16Mb x 16]
256Mb
216Mb
144Mb
Configuration 3
2 x [4Mb x 32]
256Mb
216Mb
144Mb
2 x [8Mb x 32]
512Mb
504Mb
288Mb
Configuration 4
2 x [4Mb x 32]
256Mb
122Mb
108Mb
2 x [8Mb x 32]
512Mb
284Mb
252Mb
Configuration 5
2 x [8Mb x 16]
256Mb
252Mb
144Mb
2 x [16Mb x 16]
512Mb
504Mb
288Mb
Configuration 6
3 x [8Mb x 16]
384Mb
284Mb
252Mb
3 x [16Mb x 16]
768Mb
567Mb
504Mb
Configuration 7
4 x [8Mb x 16]
512Mb
504Mb
288Mb
4 x [16Mb x 16]
1Gb
1008Mb
576Mb
TABLE 5 – TOTAL USEABLE MEMORY BASED ON VARIOUS CONFIGURATIONS
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