你们好,我想请教一下有关44b0x中关于 BANKCONn寄存器的一些设置。
Tacs [14:13] Address set-up before nGCSn 00 = 0 clock 01 = 1 clock 10 = 2 clocks 11 = 4 clocks 00
Tcos [12:11] Chip selection set-up nOE 00 = 0 clock 01 = 1 clock 10 = 2 clocks 11 = 4 clocks 00
Tacc [10:8] Access cycle 000 = 1 clock 010 = 3 clocks 100 = 6 clocks 110 = 10 clocks 001 = 2 clocks 011 = 4 clocks 101 = 8 clocks 111 = 14 clocks 111
Toch [7:6] Chip selection hold on nOE 00 = 0 clock 01 = 1 clock 10 = 2 clocks 11 = 4 clocks 000
请问 这里的 Tacs 什么意思呀? 这里应该怎么设置呢? 还有 Tacc。 Toch 这些都是什么意思?
另外,在总线宽度寄存器(BWSCON)中
WS4 [18] This bit determines WAIT status for bank 4
0 = WAIT disable 1 = WAIT enable
请问这里 WAIT 什么意思?
ps:我是从linux上层应用程序转过来的, 第一次接触这些东西,请大家多多指教,自己查资料查了好几天,才看懂别人驱动中#define LCD_REG (*(volatile unsigned short *)(0x08000000|(0<<1))) 这里是 nGCS4 片选。请大家多多指教,我也好少走弯路。谢谢。 |