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參數(shù)資料
| 型號： | AU1100LCDPERF_30274A |
| 英文描述： | AMD Alchemy? SolutionsAu1100? Processor LCD Performance Application Note? 574KB (PDF) |
| 中文描述： | 采用AMD Alchemy？ SolutionsAu1100？處理器液晶性能應(yīng)用筆記？ 574KB（PDF格式） |
| 文件頁數(shù)： | 10/19頁 |
| 文件大?。?/td> | 574K |
| 代理商： | AU1100LCDPERF_30274A |
10
Application Note
Rev. 30274A April 2003
AMD Alchemy Solutions Au1100 Processor LCD Performance
By comparing the time to fill a buffer from this table with that of the time to empty a buffer in Table
4: “LCD 320-Word Buffer Empty Time”, it is apparent that a number of display configurations,
especially the 12bpp and 16bpp configurations, are susceptible to display artifacts when accessing
slow PCMCIA cards. For example, the 640x480x16bpp display refresh fails if PCMCIA card
accesses consistently need 600ns (buffer fill time of 28,840ns exceeds buffer empty time of
26,624ns).
Also note that this example does not take into consideration peripherals other than the Au1 core and
LCD controller which may request the system bus. System bus requests by other peripherals simply
add more time to the actual time needed to fill a 320-word buffer.
In addition, AMD has observed some PCMCIA cards assert PWAIT# to extend the transfer time to
1,000ns (1 microsecond), and even longer. If the Au1100 processor based product permits using
PCMCIA cards with this type of transfer time, the ability to fill the 320-word buffer in the allotted
time is extremely difficult, and will result in display artifacts.
The number of 320-word buffer fills needed per refresh for common configurations is provided in
Table 6.
Table 5: PCMCIA and LCD Transfer Times
PCMCIA Transfer Time
40 PCMCIA Accesses
40 SDRAM Accesses
PCMCIA +LCD
Time
150ns
6,000ns
4,840ns
10,840ns
200ns
8,000ns
4,840ns
12,840ns
250ns
10,000ns
4,840ns
14,840ns
300ns
(PWAIT# asserted)
12,000ns
4,840ns
16,840ns
350ns
(PWAIT# asserted)
14,000ns
4,840ns
18,840ns
400ns
(PWAIT# asserted)
16,000ns
4,840ns
20,840ns
500ns
(PWAIT# asserted)
20,000ns
4,840ns
24,840ns
600ns
(PWAIT# asserted)
24,000ns
4,840ns
28,840ns
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