Exabyte EXB-8505 8mm manual Preamp and Upper Analog Cards, Lower Digital SLD Card

1Features

Preamp and Upper Analog Cards

A Preamp card (SPR card) contains preamplifier, motor, and write driver circuitry.

The Upper Analog card (SUA card in the EXB-8505 and EXB-8505XL; VUA card in the EXB-8205 and EXB-8205XL) contains analog filters, equalization, and clock-detect circuitry.

Together, the preamp and upper analog cards comprise the write and read electronics. The write electronics consist of write control circuits for digital data and servo information, as well as the write head driver circuits. The read electronics consist of preamplifiers and equalization circuits for the read channels, the servo channel, amplitude sensing, and data clocking and detection.

Lower Digital (SLD) Card

The Lower Digital (SLD) card contains the data processor, error correction code, buffer memory, and control circuitry. The tape drive’s data buffer includes 1 MByte of dynamic random access memory (DRAM).

The SLD card controls communication between the tape drive and the SCSI bus, and can be either of the following:

SLDS (single-ended SCSI)

SLDD (differential SCSI)

The SLD card contains a 8051-compatible microprocessor, which implements the controller function. The controller function includes the following activities:

Data compression SCSI bus management

SCSI command decode and status presentation Scheduling of all tape drive operations Motion control management

Data transfer and buffer management Logical-to-physical block packing and unpacking Tape formatting; header and search field generation Read-after-write verification and rewrite management Tape drive statistics and sense data

Error recovery procedures Monitor interface

1-megabyte buffer

1-16	EXB-8205 and EXB-8505	510504
	(Standard and XL)