Slave I/O driver calibration using error-nulling master...

Details Slave I/O driver calibration using error-nulling master... Slave I/O driver calibration using error-nulling master...

2007-03-20

2007-03-20

Peyton, Tammara (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

C710S009000, C710S010000, C716S030000, C716S030000, C327S108000, C362S230000, C702S107000

Reexamination Certificate

active

10231863

ABSTRACT:
Methods and devices for calibrating a driver on a slave device, using a master device driver as a load, are disclosed. A master reference driver is integrated on the same circuit as the master device driver, with both drivers having the same layout and geometry. The master reference driver is calibrated using a selected load impedance that includes the nominal slave device driver impedance and any other impedance elements. The same calibrated driver setting is concurrently applied to both the master driver and the master reference driver, while the slave device drives the master driver. The voltage at the master driver is compared to the voltage at the master reference driver, and the slave device driver impedance is adjusted until those voltages match. The resulting calibration of the slave device driver impedance is largely independent of the actual impedance of the master device driver.

REFERENCES:
patent: 5666078 (1997-09-01), Lamphier et al.
patent: 6085033 (2000-07-01), Starr et al.
patent: 6087847 (2000-07-01), Mooney et al.
patent: 6292407 (2001-09-01), Porter et al.
patent: 6807650 (2004-10-01), Lamb et al.
DDR-II SDRAM, OCD Impedance Adjustment; JEDEC; Nov. 2, 1999, pp. 2-6.

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