HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 331
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HD6417641
Manufacturer Part Number
HD6417641
Description
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417641.pdf
(1036 pages)
- Current page: 331 of 1036
- Download datasheet (5Mb)
12.4.2
CSnBCR is a 32-bit readable/writable register that specifies the function of each area, the number
of idle cycles between bus cycles, and the bus-width. This register is initialized to H'36DB0600 by
a power-on reset, and it is not initialized by a manual reset and in the standby mode.
Do not access external memory other than area 0 until CSnBCR register initialization is
completed.
Bit
0
Bit
31
30
29
28
CSn Space Bus Control Register (CSnBCR) (n = 0, 2, 3, 4, 5A, 5B, 6A, 6B)
Bit Name
HIZCNT
Bit Name
IWW2
IWW1
IWW0
Initial
Value
0
Initial
Value
0
1
1
1
R/W
R/W
R/W
R
R/W
R/W
R/W
High-Z Control
Description
Specifies the state in software standby mode and bus
released for CKIO2, RASU, RASL, CASU, and CASL.
0: High impedance in software standby mode and bus
1: Driven in standby mode and bus released for
Description
Reserved
This bit is always read as 0. The write value should
always be 0.
Idle Cycles between Write-Read Cycles and Write-
Write Cycles
These bits specify the number of idle cycles to be
inserted after the access to a memory that is
connected to the space. The target access cycles are
the write-read cycle and write-write cycle.
000: No idle cycle inserted
001: 1 idle cycle inserted
010: 2 idle cycles inserted
011: 4 idle cycles inserted
100: 6 idle cycles inserted
101: 8 idle cycles inserted
110: 10 idle cycles inserted
111: 12 idle cycles inserted
released for CKIO2, RASU, RASL, CASU, and
CASL.
CKIO2, RASU, RASL, CASU, and CASL.
Rev. 4.00 Sep. 14, 2005 Page 281 of 982
Section 12 Bus State Controller (BSC)
REJ09B0023-0400
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