JPH01224819A - Bus control system - Google Patents

Abstract

PURPOSE:To attain the simultaneous using of buses which have different polarities in the same digital system and to attain the independent parallel using of the buses by connecting the bus of a precharging type and the bus of a discharging type, and controlling. CONSTITUTION:A bus switch circuit 103 to control the discharging means of a bus BUS1 side of a precharging type by the data of a bus BUS2 of a discharg ing type and to control the precharging means of the bus BUS2 side of the discharging type by the data of the bus BUS1 of the precharging type is pro vided between the buses which have different polarities. Thus, the connecting and controlling of the bus of the precharging type and the bus of the discharging type which have the different 2,... polarities can be executed, and in a period when registers R1-1, R1-2, and R2-1, R2-2,... output the data to the BUS1 and the BUS2, the parallel using of the BUS1 and the BUS2 is attained by keeping a SW1 an 'L' and a SW2 an 'H'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to control of connection and disconnection between buses of different polarity within a digital system.

[Conventional technology]

According to the above conventional system, bus switching was possible only between precharge type buses. However, no consideration is given between precharge type and discharge type buses.

FIG. 2 shows how a conventional bus is used.

Both BUS-A and Bus-B are precharge type buses, and when the clock signal 7 is at the low side voltage source level (hereinafter referred to as taL) L'', the P-channel MoS transistors 202 and 203 connect to BUS-A. BUS
-B is precharged. When the 7th unit is at the high side voltage source level (hereinafter referred to as HH) “H”, RA-1, R
A-2°...and one of RB-1, RB-2,... discharges BUS-A or BUS-B. For example, when RA-1 discharges BUS-A, It L Tl data is transmitted to BUS-B via the bus switch circuit 201 according to the prior art. 41 L from BUS-B to BUS-A
71 data transmission can be performed similarly.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration bus connection control when the polarities of the buses are different.

An object of the present invention is to perform connection control between a precharge type bus and a discharge type bus having different polarities.

[Means to solve the problem]

The above object is to control the discharge means on the bus side of the precharge type by the data of the discharge type bus between buses of different polarities.

This is achieved by providing a bus switch circuit that controls the precharge means on the discharge type bus side using the data on the precharge type bus.

[Effect]

The discharge means provided on the precharge type bus is controlled by the discharge type bus signal and one or more control signals. By synchronizing the discharge timing with the output of the register connected to the precharge type bus, that is, the timing of the discharge operation, by this control signal, the precharge means of the precharge type bus and the discharge means There is no competition with Similarly, the precharge means provided on the discharge type bus is controlled by the precharge type bus signal and one or more control signals. By using this control signal, the precharge timing is synchronized with the output of the register connected to the discharge type bus, that is, the timing of the precharge operation, so that the discharge means of the discharge type bus and the precharge means are synchronized. There is no conflict.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. B.U.
Sl is a precharge type bus. Also, BUS
2 is a discharge type bus. When the φ1 signal is “H”, that is, when the 7th signal is “L It”, the P channel transistor 101 becomes conductive and BUS 1
is precharged to Vcc level, N-channel transistor 102 becomes conductive, and BUS2 is discharged to GND level. Next, the φ1 signal is “L”, that is,
During the period when the T signal becomes lHlj and the P channel transistor 101 and the N channel transistor 102 are non-conductive, any one of the registers R1-1, R1-2, . . . When outputting data by discharging BUSI,
If SW2 is "'L" during this period, the P-channel transistor 105 becomes conductive, the P-channel transistor 104 also becomes conductive due to the BUSI llL" data, and BUS2 is precharged. That is, B
The "L'" data of US1 is transmitted to BUS2 as "H" data, and registers R1-2 and R1-1
, -..., the output data of one register is R2
This means that transmission to one or more registers among -1, R2-2, . . . has been realized. Next, during the period when the P-channel transistor 101 and the N-channel transistor 102 are in a non-conducting state, R2-1, R2-2,...
・If any one of the registers is connected to BUS2, BU
When data is output by precharging S2, if SW1 is "'H" during this period, N
Channel transistor 106 becomes conductive, N-channel transistor 107 also becomes conductive due to the "H" data on BUS2, and BUS1 is discharged. In other words, "HTl data of BUS2 is transferred to BUS"1".
This means that the data is transmitted as L'''' data, and the register R2-
This means that the output data of one register among R1-1, R2-2, . . . is transmitted to one or more registers among R1-1, R1-2, .

In addition, registers R1-1, R1-2, ... and R2-
1, R2-2, ... output data to BUS1 and BUS2, SWI is set to "L u" and SW2 is set to itH.
” By continuing to maintain it, BUS1 and BUS2 can be used in parallel.

〔Effect of the invention〕

According to the present invention, it is possible to control the connection of precharge type buses and discharge type buses, so it is possible to use buses with different polarities simultaneously within the same digital system, and to use these buses independently and in parallel. It also has the effect of making it possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a bus control method according to the present invention, and FIG. 2 is a diagram showing a bus control method according to the prior art. R1-4, R1-2, . . . , registers that output “L” data to the bus, R2-1, R2-2, . . . . A register that outputs "Pa II" data to the bus. 101.104, 105 . . . P channel transistor, 102, 106, 107 - N channel transistor,
103... Bus switch circuit based on the bus usage method of the present invention.

Claims (1)

[Claims] 1. Between a pre-charge type bus and a discharge type bus, the pre-charge type bus is equipped with a discharge means, the discharge type bus is equipped with a pre-charge means, and the pre-charge type bus is equipped with a pre-charge type bus by the discharge means. The discharge operation of the bus is controlled by the data of the discharge type bus and one or more control lines, and the precharge operation of the discharge type bus by the precharge means is controlled by the data of the precharge type bus and one or more control lines.
1. A bus control system, characterized in that the bus is controlled by one or more control lines, and enables mutual data transmission between the precharge type bus and the discharge type bus.