Rainbow Electronics W90N745CDG - Manual (Page 78)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 73 - Revision A2
Continued.
BITS DESCRIPTION
[15] ADRS
Address bus alignment for external I/O bank 0~3
When ADRS is set, external address (A20~A0) bus is alignment to byte
address format, that is, A0 is internal AHB address bus HADDR[0] and A1 is
AHB bus HADDR[1] and so forth. And it ignores DBWD [1:0] setting.
[14:11] tACC
Access cycles of external I/O bank 0~3
This parameter means nWE, nWBE and nOE active time clock. Detail timing
diagram please refer to Figure 6.3.6 and 6.3.7
tACC[14:11] MCLK tACC[14:11] MCLK
0 0 0 0 Reversed 1 0 0 0 9
0 0 0 1 1 1 0 0 1 11
0 0 1 0 2 1 0 1 0 13
0 0 1 1 3 1 0 1 1 15
0 1 0 0 4 1 1 0 0 17
0 1 0 1 5 1 1 0 1 19
0 1 1 0 6 1 1 1 0 21
0 1 1 1 7 1 1 1 1 23
[10:8] tCOH
Chip selection hold time of external I/O bank 0~3
This parameters control nWBE and nOE hold time. Detail timing diagram
please refer to Figure 6.3.6 and 6.3.7
tCOH [10:8] MCLK
0 0 0 0
0 0 1 1
0 1 0 2
0 1 1 3
1 0 0 4
1 0 1 5
1 1 0 6
1 1 1 7