HD6417706F133 Renesas Electronics America, HD6417706F133 Datasheet - Page 297
HD6417706F133
Manufacturer Part Number
HD6417706F133
Description
IC SUPERH MPU ROMLESS 176LQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7700r
Datasheet
1.HD6417706F133V.pdf
(751 pages)
Specifications of HD6417706F133
Core Processor
SH-3
Core Size
32-Bit
Speed
133MHz
Connectivity
EBI/EMI, FIFO, SCI, SmartCard
Peripherals
DMA, POR, WDT
Number Of I /o
103
Program Memory Type
ROMless
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.75 V ~ 2.05 V
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
176-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
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Part Number:
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Manufacturer:
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- Current page: 297 of 751
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Section 8 Bus State Controller (BSC)
8.5.7
Waits between Access Cycles
A problem associated with higher external memory bus operating frequencies is that data buffer
turn-off on completion of a read from a low-speed device may be too slow, causing a collision
with data in the next access. This results in lower reliability or incorrect operation. To avoid this
problem, a data collision prevention feature has been provided. This memorizes the preceding
access area and the kind of read/write. If there is a possibility of a bus collision when the next
access is started, a wait cycle is inserted before the access cycle thus preventing a data collision.
There are two cases in which a wait cycle is inserted: when an access is followed by an access to a
different area, and when a read access is followed by a write access from this LSI. When this LSI
performs consecutive write cycles, the data transfer direction is fixed (from this LSI to other
memory) and there is no problem. With read accesses to the same area, in principle, data is output
from the same data buffer, and wait cycle insertion is not performed. Bits AnIW1 and AnIW0 (n =
0, 2 to 6) in WCR1 specify the number of idle cycles to be inserted between access cycles when a
physical space area access is followed by an access to another area, or when this LSI performs a
write access after a read access to physical space area n. If there is originally space between
accesses, the number of idle cycles inserted is the specified number of idle cycles minus the
number of empty cycles.
Waits are not inserted between accesses when bus arbitration is performed, since empty cycles are
inserted for arbitration purposes.
Rev. 5.00 May 29, 2006 page 247 of 698
REJ09B0146-0500
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