HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 194
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 8 Bus State Controller (BSC)
For details on bus cycles when external spaces are accessed, see section 8.4, Accessing External
Memory Space, section 8.5, DRAM Interface Operation, and section 8.6, Address/Data
Multiplexed I/O Space Access.
Accesses to on-chip spaces are as follows: On-chip supporting module spaces (area 5 when
address bit A27 is 1) are always 3-state access spaces, regardless of WCR, with no WAIT signal
sampling. Accesses to on-chip ROM (area 0 when MD2–MD0 are 010) and on-chip RAM (area 7
when address bit A27 is 0) are always performed in 1 state, regardless of WCR, with no WAIT
signal sampling.
) are not observed when the WAIT signal is input
If the bus timing specifications (t
and t
WTS
WTH
in external space access, this will simply mean that WAIT signal assertion and negation will not
be detected, but will not result in misoperation. Note, however, that the inability to detect WAIT
signal assertion may result in a problem with memory access due to insertion of an insufficient
number of waits.
Rev. 7.00 Jan 31, 2006 page 168 of 658
REJ09B0272-0700
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