SH7641 Datasheet, PDF (448/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 12 Bus State Controller (BSC)
(2) Transfer from the SDRAM interface to the external device with DACK
BSC Register Setting*²
CS3BCR Idle Setting
CS3WCR.WTRP Setting
Minimum Number of
Idle Cycles
0
0
3
0
1
3
0
2
3
0
3
4
1
0
3
1
1
3
1
2
3
1
3
4
2
0
3
2
1
3
2
2
3
2
3
4
4
0
5
4
1
5
4
2
5
4
3
5
n (n>=6)

n+1
Notes:
DMAC is operated by Bφ. The minimum number of idle cycles is not affected by
changing a clock ratio.
1. For single transfer from the external device with DACK to the SDRAM interface, the
minimum number of idle cycles is not affected by the IWW, IWRWD, IWRWS, IWRRD,
and IWRRS bits in CSnBCR.
For CMNCR.DMIWA = 0, the setting is identical to CMNCR.DMAIW[1:0] in (1) in the
above table.
2. Minimum number of idle cycles for other than the above cases.
Rev. 4.00 Sep. 14, 2005 Page 398 of 982
REJ09B0023-0400