Section 12 DDR-SDRAM Interface (DDRIF)
Rev.1.00 Dec. 13, 2005 Page 429 of 1286
REJ09B0158-0100
12.5.6 Address
Multiplexing
Address multiplexing is performed in line with the settings of the SPLIT bits in SDR so that
connecting the SDRAM does not require an external address-multiplexing circuit. Table 12.7
shows the relationship between the settings of SPLIT bits and address multiplexing. The number
of ROW or COL line is the addresses (bit) that are output to the address pins according to the
setting of the SPLIT bits. If a setting not specified in table 12.7 is used, correct operation is not
guaranteed.
Table 12.7 Relationship between SPLIT Bits and Address Multiplexing
SPLIT[3:0] ROW × COL
BA1
BA0 MA13 MA12 MA11 MA10 MA9 MA8 MA7 MA6 MA5 MA4 MA3 MA2 MA1 MA0
128 Mbit × 2
0001
12 × 9
ROW
13
12
— — 11 24 23 22 21 20 19 18 17 16 15 14
(8 M × 16 bit × 2)
COL
13
12
— — — AP
*
—
10 9 8 7 6 5 4 3 2
256 Mbit × 2
0011
13 × 9
ROW
13
12
— 11 25 24 23 22 21 20 19 18 17 16 15 14
(16 M × 16 bit × 2)
COL
13
12
— — — AP
*
—
10 9 8 7 6 5 4 3 2
512 Mbit × 2
0100
13 × 10
ROW
13
12
— 26 25 24 23 22 21 20 19 18 17 16 15 14
(32 M × 16 bit × 2)
COL
13
12
— — — AP
*
11
10 9 8 7 6 5 4 3 2
1 Gbit × 2
0110
14 × 10
ROW
13
12
27 26 25 24 23 22 21 20 19 18 17 16 15 14
(64 M × 16 bit × 2)
COL
13
12
— — — AP
*
11
10 9 8 7 6 5 4 3 2
Note:
*
Auto-precharge
Содержание SH7780 Series
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Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
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Страница 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
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