Section 7 Bus State Controller (BSC)
Rev. 2.00 Mar 09, 2006 page 254 of 906
REJ09B0292-0200
7.1.4
Register Configuration
The BSC has ten registers. These registers are used to control wait states, bus width, interfaces
with memories like DRAM, synchronous DRAM, and burst ROM, and DRAM and synchronous
DRAM refreshing. The register configurations are shown in table 7.2.
The size of the registers themselves is 16 bits. If read as 32 bits, the upper 16 bits are 0.
In order to
prevent writing mistakes, 32-bit writes are accepted only when the value of the upper 16 bits of the
write data is H'A55A; no other writes are performed.
Initialize the reserved bits.
Initialization Procedure:
Do not access a space other than CS0 until the settings for the interface
to memory are completed.
Table 7.2
Register Configuration
Name
Abbr.
R/W Initial Value Address
*
1
Access Size
Bus control register 1
BCR1
R/W H'03F0
H'FFFFFFE0 16
*
2
, 32
Bus control register 2
BCR2
R/W H'00FC
H'FFFFFFE4 16
*
2
, 32
Bus control register 3
BCR3
R/W H'0F00
H'FFFFFFFC 16
*
2
, 32
Wait control register 1
WCR1
R/W H'AAFF
H'FFFFFFE8 16
*
2
, 32
Wait control register 2
WCR2
R/W H'000B
H'FFFFFFC0 16
*
2
, 32
Wait control register 3
WCR3
R/W H'0000
H'FFFFFFC4 16
*
2
, 32
Individual memory control register
MCR
R/W H'0000
H'FFFFFFEC 16
*
2
, 32
Refresh timer control/status register RTCSR
R/W H'0000
H'FFFFFFF0 16
*
2
, 32
Refresh timer counter
RTCNT
R/W H'0000
H'FFFFFFF4 16
*
2
, 32
Refresh time constant register
RTCOR
R/W H'0000
H'FFFFFFF8 16
*
2
, 32
Notes: 1. This address is for 32-bit accesses; for 16-bit accesses add 2.
2. 16-bit access is for read only.
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 ...