Kftha Module - Compaq AlphaServer GS60E Service Manual

The KFTHA module is designed for high-speed, high-volume data transfers.
Direct memory access (DMA) transfers are pipelined to allow for up to 500
Mbytes/second throughput. The major elements of the KFTHA module are:
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RAM to buffer data for the DMA transfers.
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Four hose-to-data (HDP) chips, each handling 32 bits from two "hoses"
(I/O cables connecting to an adapter in an associated I/O bus). Data on
the HDPs flow in one direction; either "up" (to the KFTHA) or "down" (to
the I/O adapter).
˜
Four I/O data path (IDP) chips, which together handle a 256-bit data
transfer to or from the TLSB system bus.
™
An I/O control chip (ICC) houses the primary control logic for the TLSB
interface.
š
A DC-to-DC converter that converts the 48 VDC system power to the DC
voltage required by the KFTHA module.
Figure 1–6 KFTHA Module
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SM16-99
Introduction 1-11