12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 477 of 1658
REJ09B0261-0100
When the external bus width is set to 16 bits
Address 16n + 0
Address 16n + 8
1st access
2nd access
16n + 0
16n + 8
16n + 8
16n + 0
16-byte read/write access (a total of two commands are issued)
Address 32n + 0
Address 32n + 8
Address 32n + 16
Address 32n + 24
1st access
2nd access
3rd access
4th access
32n + 0
32n + 8
32n + 16
32n + 24
32-byte read access (a total of four commands are issued)
32n + 0
32n + 8
32n + 16
32n+ 24
32n + 16
32n + 24
32n + 0
32n + 8
32n + 16
32n + 24
32n + 0
32n + 8
Address 32n + 0
Address 32n + 8
Address 32n + 16
Address 32n + 24
1st access
2nd access
3rd access
4th access
32n + 0
32n + 8
32n + 16
32n + 24
32-byte write access (a total of four commands are issued)
32n + 0
32n + 8
32n + 16
32n + 24
32n + 16
32n + 24
32n + 0
32n + 8
32n + 16
32n + 24
32n + 0
32n + 8
Figure 12.3 Addresses Generated upon 16/32-Byte Access when the External Data Bus
Width Is 16 Bits
Содержание SH7781
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