Patent ID: 7739430
Filing Date: 2010-06-15
Classification: G11C,H01L

Abstract:
1. A semiconductor integrated circuit provided with a plurality of output modes including a variable (m×n) bit output mode, in which m is a natural number not smaller than 2, and n is a natural number; and an n-bit output mode, comprising: (m×n) input/output I/O portions outputting signals to the outside; wherein in the variable (m×n)-bit output mode, the (m×n) I/O portions output data for a bus width of (m×n) bits; and in the n-bit output mode, the (m×n) I/O portions output data for a bus width of n bits, wherein in the n-bit output mode, at least two of the (m×n) I/O portions outputs the same data simultaneously for each of said n bits, wherein: in the case where m is equal to 2, a 2n-bit output mode and an n-bit output mode are provided; in the 2n-bit output mode, s-th one (1≦s≦2n) of 2n I/O portions outputting data with a bus width of 2n bits outputs an s-th bit of data with the bus width of 2n bits; and in the n-bit output mode, (2t−1)-th and 2t-th ones (1≦t≦n) of 2n I/O portions output a t-th bit of data with the bus width of n bits.