Section 7 Bus State Controller (BSC)
Rev. 2.00 Mar 09, 2006 page 252 of 906
REJ09B0292-0200
7.1.3
Pin Configuration
Table 7.1 shows the BSC pin configuration.
Table 7.1
Pin Configuration
Signal
I/O
With Bus
Released
Description
A24–A0
O
Hi-Z
Address bus. 32 Mbytes of memory space can be specified with 25
bits
D31–D0
I/O
Hi-Z
32-bit data bus. When reading or writing a 16-bit width area, use
D15–D0; when reading or writing a 8-bit width area, use D7–D0.
With 8-bit accesses that read or write a 32-bit width area, input and
output the data via the byte position determined by the lower
address bits of the 32-bit bus
BS
O
Hi-Z
Indicates start of bus cycle or monitor. With the basic interface
(device interfaces except for DRAM, synchronous DRAM), signal is
asserted for a single clock cycle simultaneous with address output.
The start of the bus cycle can be determined by this signal
CS0
–
CS4
O
Hi-Z
Chip select.
CS3
is not asserted when the CS3 space is DRAM
space
RD/
WR
O
Hi-Z
Read/write signal. Signal that indicates access cycle direction
(read/write). Connected to
WE
pin when DRAM/synchronous
DRAM is connected
RAS
O
Hi-Z
RAS
pin for DRAM/synchronous DRAM
CAS
/
OE
O
Hi-Z
Open when using DRAM
Connected to
OE
pin when using EDO RAM
Connected to
CAS
pin when using synchronous DRAM
RD
O
Hi-Z
Read pulse signal (read data output enable signal). Normally,
connected to the device’s
OE
pin; when there is an external data
buffer, the read cycle data can only be output when this signal is
low
WAIT
I
Don’t care
Hardware wait input
BRLS
I
I
Bus release request input
BGR
O
O
Bus grant output
CKE
O
O
Synchronous DRAM clock enable control. Signal for supporting
synchronous DRAM self-refresh
IVECF
O
O
Interrupt vector fetch
DREQ0
I
I
DMA request 0
DACK0
O
O
DMA acknowledge 0
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 ...