| 摘要 |
The two column address strobe (CAS) one write enable (WE) mode or the one CAS two WE mode are selected by the pad switching circuit turned on or off by a bonding option. The pad switching circuit comprises a CAS pad switching circuit and a WE pad switching circuit. The CAS pad switching circuit comprises two CAS pad, a CAS pad switch (MN2, MN2) turned on or off according to bonding options, a CAS U buffer (10), and a CAS L buffer (20) connected to CAS U pad or CAS L pad according to the switch status. The WE pad switching circuit comprises two WE pad, a WE pad switch (MN3,MN4) turned on or off according to bonding option, a WEU buffer (30) connected to WE U pad, and a WE L buffer (40) connected to WE U pad or WE L pad according to the switch status.
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