251
For Synchronous DRAM Interface:
Bit6:
AMX3
Bit5:
AMX2
Bit 4:
AMX1
Bit 3:
AMX0
Description
1
1
0
1
The row address begins with A10
.
(The A10 value is output at
A1 when the row address is output. 4M
×
16-bit
×
4-bank
products)
1
0
The row address begins with A11
.
(The A11 value is output at
A1 when the row address is output. 8M
×
16-bit
×
4-bank
products)
*
1
0
1
0
0
The row address begins with A9
.
(The A9 value is output at A1
when the row address is output. 1M
×
16-bit
×
4-bank
products) (Initial
value)
1
The row address begins with A10
.
(The A10 value is output at
A1 when the row address is output. 2M
×
8-bit
×
4-bank
products)
1
1
The row address begins with A9
.
(The A9 value is output at A1
when the row address is output. 512k
×
32-bit
×
4-bank
products)
*
2
0
0
0
0
Begin synchronous DRAM access after setting AMX3 to 0 =
*
1
**
.
Except above value
Reserved (Setting prohibited)
Note:
*
1 Can only be set when using a 16-bit bus width.
*
2 Can only be set when using a 32-bit bus width.
Bit 2—Refresh Control (RFSH): The RFSH bit determines whether or not synchronous DRAM
refresh operations are is performed. If the refresh function is not used, the timer for generation of
periodic refresh requests can also be used as an interval timer.
Bit 2: RFSH
Description
0
No refresh
(Initial value)
1
Refresh
Содержание SH7709S
Страница 2: ...Hitachi SuperH RISC engine SH7709S Hardware Manual ADE 602 250 Rev 1 0 09 21 01 Hitachi Ltd ...
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
Страница 323: ...304 Tp TRr TRrw TRrw CKIO CKE CSn RAS3U RAS3L CASU CASL RD WR Figure 10 28 Synchronous DRAM Auto Refresh Timing ...
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