249
10.2.5
Individual Memory Control Register (MCR)
The individual memory control register (MCR) is a 16-bit readable/writable register that specifies
RAS
and
CAS
timing for synchronous DRAM (areas 2 and 3), specifies address multiplexing, and
controls refresh. This enables direct connection of synchronous DRAM without external circuits.
MCR is initialized to H'0000 by a power-on reset, but is not initialized by a manual reset or in
standby mode. Bits TPC1–TPC0, RCD1–RCD0, TRWL1–TRWL0, TRAS1–TRAS0, RASD, and
AMX3–AMX0 are written to in the initialization after a power-on reset and should not then be
modified again. When RFSH and RMODE are written to, write the same values to the other bits.
When using synchronous DRAM, do not access areas 2 and 3 until this register is initialized.
Bit:
15
14
13
12
11
10
9
8
TPC1
TPC0
RCD1
RCD0
TRWL1
TRWL0
TRAS1
TRAS0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
RASD
AMX3
AMX2
AMX1
AMX0
RFSH
RMODE
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
Bits 15 and 14—RAS Precharge Time (TPC1, TPC0): When synchronous DRAM interface is
selected as connected memory, they set the minimum number of cycles until output of the next
bank-active command after precharge.
Bit 15: TPC1
Bit 14: TPC0
Description
0
0
1 cycle
(Initial value)
1
2 cycles
1
0
3 cycles
1
4 cycles
Summary of Contents for SH7709S
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