SH7203 Datasheet, PDF (294/1686 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 9 Bus State Controller (BSC)
Bit
6
5 to 0
Bit Name
WM
⎯
Initial
Value
0
All 0
R/W Description
R/W External Wait Mask Specification
Specifies whether or not the external wait input is
valid. The specification by this bit is valid even when
the number of access wait cycle is 0.
0: External wait input is valid
1: External wait input is ignored
R
Reserved
These bits are always read as 0. The write value
should always be 0.
• CS4WCR
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
-
-
-
-
-
-
-
-
-
BST[1:0]
-
-
BW[1:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
R
R R/W R/W R
R R/W R/W
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
-
-
SW[1:0]
W[3:0]
WM
-
-
-
-
HW[1:0]
Initial value: 0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
R/W: R
R
R R/W R/W R/W R/W R/W R/W R/W R
R
R
R R/W R/W
Bit
Bit Name
31 to 22 ⎯
21, 20 BST[1:0]
Initial
Value
All 0
00
R/W Description
R
Reserved
These bits are always read as 0. The write value
should always be 0.
R/W Burst Count Specification
Specify the burst count for 16-byte access. These bits
must not be set to B'11.
Bus Width BST[1:0] Burst count
8 bits
00
16 burst × one time
01
4 burst × four times
16 bits
00
8 burst × one time
01
2 burst × four times
10
4-4 or 2-4-2 burst
32 bits
xx
4 burst × one time
Rev. 2.00 Apr. 16, 2008 Page 264 of 1652
REJ09B0313-0200