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參數資料
| 型號： | W3100A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | i2Chip W3100A |
| 中文描述： | i2Chip W3100A |
| 文件頁數： | 40/63頁 |
| 文件大小： | 557K |
| 代理商： | W3100A |
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Application Information
W3100A MCU I/F is comprised of Direct Bus I/F Mode, Indirect Bus I/F Mode, and I
2
C I/F Mode
1. Relationship between MCU Bus I/F Mode and Mode pin (M[2:0])
M2
M1
M0
Description
0
0
0
Clocked mode
Mode using a clock to analyze the MCU bus signal (default mode)
0
0
1
External clocked mode
Mode using an external clock to analyze the MCU bus signal
0
1
0
Non-clocked mode
I
2
C
mode
Mode directly using the MCU bus signal
Mode using
I
2
C
0
1
1
1
X
X
Test mode
Mode used at the manufacturing plant for testing
Not to be used by the average user
Refer to the timing by mode diagram for detailed access timing for each mode. (Page 50 – page 58)
Considering the I/F between the MCU and W3100A, Clocked mode, External clocked mode, or Non-clocked
mode can be used if Bus I/F is provided by the MCU. Timing is slightly different in each mode, and MCU
bus timing also needs to be considered before selecting the mode.
The first thing to consider in selecting the mode is the relationship among /CS, /RD, /WR, and Address[14:0]
granted to the W3100A.
If /CS is low and /RD, /WR, and Address[14:0] have valid signals over 100ns, use Clocked mode. This mode
is the default mode and is suitable for most systems.
However, some systems require faster access (access time of less than 100ns) to the W3100A, in which case
either the External clocked mode or the Non-clocked mode should be selected.
Non-clocked mode should be used in a situation where /CS granted to the W3100A drops to low as in the
access timing diagram on page 54 and /RD or /WR goes low after 10ns. Otherwise, External clocked mode
should be used.
In the External clocked mode, the access time differs depending on the clock granted to EXT_CLK.
Therefore, caution should be taken in using External clocked mode. Refer to the access timing diagram with
EXT_CLK of 50MHz (page 52).
Generally, Clocked mode is recommended after adjusting the access time for the W3100A to 100ns or higher
(page 50), rather than using the External clocked mode.
Further details about each mode are as follows:
Clocked mode is used in internal functions and in the MCU I/F using the clock granted to W3100A, and the
access timing may vary depending on the frequency (basic frequency: 25MHz). Clock basically uses
25MHz, but when a different frequency clock other than 25MHz is used, the access time of the MCU bus I/F
and timeout occurrence time can change.
In External clocked mode, the internal functions of W3100A are executed by the clock granted to the clock
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