5
1. INTRODUCTION
This chapter provides a brief introduction to the ZT 8952/8953 IDE Interface and
Mounting Board. It includes a product definition, a listing of product features, a
functional block diagram, and a description of each block. Unpacking information and
installation instructions are in Chapter 2, "
Getting Started
."
The term ZT 8952 is used throughout this manual to reference both the ZT 8952 and
the ZT 8953, except where otherwise noted.
The ZT 8952 is an Integrated Drive Electronics (IDE) interface for the STD 32 buses
that support PC-AT technology disk drives. The ZT 8952 also serves as a mechanical
mounting board for the drive, allowing for a modular plug-in unit for the STD bus. The
ZT 8952 supports 2½ inch disk drives, while the ZT 8953 supports 3½ drives, both
mounted directly to the board. The ZT 8952 is also available with no drive mounted
(ZT 8952-0) for applications that require remote mounting of the drive. Cables are
restricted to 18 inches in length from controller to drive. The ZT 8952 will support up to
two drives.
Mechanically, the ZT 8952 is compatible with the STD 32 Bus Specification. The
ZT 8952 supports 8 MHz and 5 MHz STD-80 timings, as well as STD 32 transfers. Both
8-bit and 16-bit transfers are supported under STD 32. The ZT 8952 will support up to
four Mbytes/second transfer rates on the backplane (one word every four 8-MHz
cycles.) The actual transfer rate will vary with the host CPU and drive used.
The PC-AT IDE interface is a 16-bit interface only when transferring data through the
01F0h data register. The ZT 8952 supports full 16-bit transfers for STD 32 processors.
For 8-bit processors, the ZT 8952 will byte pack and unpack the 16-bit IDE transfer to
provide 8-bit STD bus transfers. All signals are fully buffered between the STD bus and
the IDE interface. The IDE interrupt may be jumpered to drive INTRQ*, INTRQ1*,
INTRQ2* (CNTRL*), INTRQ3*, IRQx (STD 32), or one of five frontplane interrupts.
Some versions of Ziatech's STD DOS require the use of interrupts.
Onboard logic may be disabled for direct access to the IDE drive via the interface cable.
This is useful for accessing data from a board that already has an IDE interface (such
as the ZT 8910). The ZT 8952 will support an IDE drive of any capacity. The Ziatech
BIOS supports all drives sold by Ziatech. Contact Ziatech for BIOS support on drives
not supplied by Ziatech.
The ZT 8952 decodes I/O addresses 1F0h-1F7h and 3F6h-3F7h. All 16 bits of I/O
address are decoded to avoid contention at alias addresses.
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