Browse Prior Art Database

Flash ROM Update Circuit for a 2.5" HDD

IP.com Disclosure Number: IPCOM000123086D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Toga, K: AUTHOR [+3]

Abstract

Disclosed is an interface circuit that enables flash ROM update through a 44 pin ATA (AT attachment) connector that is used by a 2.5 inch hard disk drive (HDD).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Flash ROM Update Circuit for a 2.5" HDD

   Disclosed is an interface circuit that enables flash ROM
update through a 44 pin ATA (AT attachment) connector that is used by
a 2.5 inch hard disk drive (HDD).

   A current flash ROM requires 12V to update its content.  In
case of the 44 pin ATA connector, no pin is assigned for 12V supply,
so that flash ROM update could not be performed through the ATA
interface, and required an additional connector and an external
equipment such as a flash ROM writer.

   The circuit proposed assigns one of the ATA connector
pins that are not used during flash update to 12V supply.  The ATA
pin is connected to the pin of an interface LSI of the HDD that can
distinguish 12V.

   The following example assigns a CSEL pin to 12 V supply
(Fig. 1).

   The CSEL of the ATA pin goes to the CSEL of the
LSI.  There is the protection circuit between the pins so that the
CSEL of the LSI is not exposed to 12V.

   Also the CSEL is connected to a Vpp that is used as
12V supply during updating flash ROM.  This circuit enables flash
ROM update through the ATA interface.