Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Patent
1998-10-19
2000-09-05
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
710 39, 710 41, 710 44, 710131, 712229, 712245, 709213, 709229, G06F 1314, G06F 1320
Patent
active
061157589
ABSTRACT:
The present invention relates to a slot control method of a multi-port network switch and a switch structure therefor. More particularly, the present invention relates to a slot control method of a shared memory structure with a fixed sequence and a dynamic slot effect. According to the present invention, a slot processor is provided in a slot controller of a network switch for controlling and sequentially allowing a plurality of transportation ports connected to the slot controller to perform data transmission in a fixed round-robin manner while a maximum allowable slot time is set. The slot controller continuously detects whether active transportation port sends an operation request signal or whether the maximum allowable slot time is exceeded. If there is no operation request signal or the allowable slot time is exceeded, data transmission of the next transportation port is allowed and performed immediately, thereby reducing the packet latency. Further, according to the present invention, alternatively, transportation ports of low priority are distributed to operate in several cycles. Therefore, even in the case of using DRAMs, a data bus for SRAMs can achieve full line speed and be efficiently utilized.
REFERENCES:
patent: 4791629 (1988-12-01), Burns et al.
patent: 5012469 (1991-04-01), Sardana
patent: 5276703 (1994-01-01), Budin et al.
patent: 5841773 (1998-11-01), Jones
Accton Technology Corporation
Lee Thomas C.
Perveen Rehana
LandOfFree
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