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Synchronous Data Transfer for high data rate support

IP.com Disclosure Number: IPCOM000014211D
Original Publication Date: 1999-Oct-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Related People

Authors:
Katsuhiko Katoh Takashi Kuroda

Abstract

This article describes a high data transfer rate support method at lower system clock(RDWTCLK faster than system clock) by synchronous data transfer between channel to ECC(Error Correction Code) Logic. The block diagram of the high data rate transfer support method is shown as Figure. RDWTCLK is clock from read/write channel that is used for transfer between DRIVE CONTROL Logic and CHANNEL. NRZBUS is 8bit non return to zero data. DRIVE CONTROL logic transfers NRZBUS to/from CHANNEL synchronized to RDWTCLK. When ECC's field is same as NRZBUS's width , RDWTCLK that is faster than system clock can support by synchronize Parity encoder portion and Syndrome generator portion to RDWTCLK. By above description, high data transfer rate is supportable with no gate increase.(i.e. Parity encoder and Syndrome generator is not doubled or system clock that is faster than RDWTCLK is not required.) In write operation, DRIVE CONTROL logic transfers NRZBUS to CHANNEL and DATA to Parity encoder in ECC logic synchronize to RDWTCLK. After parity generation, ECC logic transfers Parity to DRIVE CONTROL logic, then DRIVE CONTROL logic transfers Parity to CHANNEL on NRZBUS synchronize to RDWTCLK. In this operation, system clock does not affect NRZBUS data transfer rate. In read operation, CHANNEL transfers NRZBUS to DRIVE CONTROL logic, then DRIVE CONTROL logic transfers DATA same as NRZBUS to Syndrome generator in ECC logic synchronize to RDWTCLK. After Syndrome generation, Decoder ECC logic solves error location/pattern from generated syndromes synchronize to system clock. In this operation, system clock does not affect NRZBUS data transfer rate.