H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
363/10
H04Q 11/04 (2006.01) H04Q 3/52 (2006.01) H04Q 11/06 (2006.01)
Patent
CA 1200929
ABSTRACT OF THE DISCLOSURE A time-switch circuit for use in a primary time switch (PTSW), a secondary time switch (STSW), and a space switch (SSW) of a digital time-division switching system is disclosed. The time switch comprises a plurality of memory circuits (MUC11 to MUC15 , MUC21 to MUC25). Each memory circuit comprises a memcry unit (MEM), an address buffer (AB) for a first address, an m-ary counter (T-CTR) for a second address, an address selector (AS) for selecting either the first or second address, an input data buffer (IB), and an output data buffer (OB). In a write cycle, input data from the input data buffer is written into the memory unit by either the first or second address signal, and in a read cycle, output data is read out of the memory unit by either the second or first address. Selection of the first and second addresses is performed by the address selector, which is controlled by an address-selection mode switch circuit (M0). Further, the write enable mode of the memory unit is controlled by a write mode switch circuit (M1).
421207
Aoyama Keizo
Miyahara Norio
Nikaido Tadanobu
Sampei Takeshi
Sato Hiroaki
Fujitsu Limited
Mcfadden Fincham
Nippon Telegraph And Telephone Corporation
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