Compaq 850 manual Diskette Drive Interface

Chapter 5 Input/Output Interfaces

5.3DISKETTE DRIVE INTERFACE

The diskette drive interface supports up to two diskette drives, each of which use a common cable connected to a standard 34-pin diskette drive connector. All models come standard with a 3.5-inch 1.44-MB diskette drive installed as drive A. The drive designation is determined by which connector is used on the diskette drive cable. The drive attached to the end connector is drive A while the drive attached to the second (next to the end) connector) is drive B.

On all models, the diskette drive interface function is integrated into the LPC47B357 super I/O component. The internal logic of the I/O controller is software-compatible with standard 82077- type logic. The diskette drive controller has three operational phases in the following order:

♦Command phase - The controller receives the command from the system.

♦Execution phase - The controller carries out the command.

♦Results phase - Status and results data is read back from the controller to the system.

The Command phase consists of several bytes written in series from the CPU to the data register (3F5h/375h). The first byte identifies the command and the remaining bytes define the parameters of the command. The Main Status register (3F4h/374h) provides data flow control for the diskette drive controller and must be polled between each byte transfer during the Command phase.

The Execution phase starts as soon as the last byte of the Command phase is received. An Execution phase may involve the transfer of data to and from the diskette drive, a mechnical control function of the drive, or an operation that remains internal to the diskette drive controller. Data transfers (writes or reads) with the diskette drive controller are by DMA, using the DRQ2 and DACK2- signals for control.

The Results phase consists of the CPU reading a series of status bytes (from the data register (3F5h/375h)) that indicate the results of the command. Note that some commands do not have a Result phase, in which case the Execution phase can be followed by a Command phase.

During periods of inactivity, the diskette drive controller is in a non-operation mode known as the Idle phase.

5-4Compaq Deskpro EXS and Workstation 300 Personal Computers

Featuring the Intel Pentium 4 Processor

First Edition – December 2000