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MB81F643242C Datasheet, PDF (18/56 Pages) Fujitsu Component Limited. – 4 X 512 K X 32 BIT SYNCHRONOUS DYNAMIC RAM | |||
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MB81F643242C-60/-70/-10 Advanced Info (AE0.1E)
Burst
Length
2
4
8
Starting Column
Address
A2 A1 A0
XX0
XX1
X00
X01
X10
X11
000
001
010
011
100
101
110
111
Sequential Mode
0â1
1â0
0â1â2â3
1â2â3â0
2â3â0â1
3â0â1â2
0â1â2â3â4â5â6â7
1â2â3â4â5â6â7â0
2â3â4â5â6â7â0â1
3â4â5â6â7â0â1â2
4â5â6â7â0â1â2â3
5â6â7â0â1â2â3â4
6â7â0â1â2â3â4â5
7â0â1â2â3â4â5â6
Interleave
0â1
1â0
0â1â2â 3
1â0â3â2
2â3â0â1
3â2â1â0
0â1â2â3â4â5â6â7
1â0â3â2â5â4â7â6
2â3â0â1â6â7â4â5
3â2â1â0â7â6â5â4
4â5â6â7â0â1â2â3
5â4â7â6â1â0â3â2
6â7â4â5â2â3â0â1
7â6â5â4â3â2â1â0
FULL COLUMN BURST AND BURST STOP COMMAND (BST)
The full column burst is an option of burst length and available only at sequential mode of burst type. This full column
burst mode is repeatedly access to the same column. If burst mode reaches end of column address, then it wraps
round to first column address (= 0) and continues to count until interrupted by the news read (READ) /write (WRIT),
precharge (PRE), or burst stop (BST) command. The selection of Auto-precharge option is illegal during the full
column burst operation except write command at BURST READ & SINGLE WRITE mode.
The BST command is applicable to terminate the burst operation. If the BST command is asserted during the burst
mode, its operation is terminated immediately and the internal state moves to Bank Active.
When read mode is interrupted by BST command, the output will be in High-Z.
For the detail rule, please refer to âTIMING DIAGRAM - 8â in section âs TIMING DIAGRAMSâ.
When write mode is interrupted by BST command, the data to be applied at the same time with BST command will
be ignored.
BURST READ & SINGLE WRITE
The burst read and single write mode provides single word write operation regardless of its burst length. In this
mode, burst read operation does not be affected by this mode.
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