Section 7 Bus State Controller (BSC)
Rev. 2.00 Mar 09, 2006 page 325 of 906
REJ09B0292-0200
A9
A1
RAS
RD/
WR
D15
D0
CAS1
CAS0
A8
A0
RAS
OE
WE
I/O15
I/O0
UCAS
LCAS
Chip
256 k
×
16-bit
DRAM
…
…
…
…
…
…
…
…
Figure 7.39 Example of DRAM Connection (16-Bit Data Width)
7.6.2
Address Multiplexing
When the CS3 space is set to DRAM, addresses are always multiplexed. This allows DRAMs that
require multiplexing of row and column addresses to be connected directly without additional
address multiplexing circuits. There are four ways of multiplexing, which can be selected using
the AMX1–AMX0 bits in MCR. Table 7.8 illustrates the relationship between the AMX1–AMX0
bits and address multiplexing. Address multiplexing is performed on address output pins A15–A1.
The original addresses are output to pins A24–A16. During DRAM accesses, AMX2 is reserved,
so set it to 0.
Table 7.8
Relationship between AMX1–AMX0 and Address Multiplexing
AMX1
AMX0
No. of Column
Address Bits
Row
Address Output
Column
Address Output
0
0
8 bits
A23–A9
A15–A1
1
9 bits
A24–A10
A15–A1
1
0
10 bits
A24–A11
*
1
A15–A1
1
11 bits
A24–A12
*
2
A15–A1
Notes: 1. Address output pin A15 is high.
2. Address output pins A15 and A14 are high.
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...