Chapter 4 PA-RISC Computer Systems - OpenPA.net

HP 9000/K-Class Internals
Chipset
Buses
� PA-7200-models: U2 I/O adapter Runway to GSC bridge
� PA-8000/PA-8200-models: UTurn I/O adapter Runway to GSC bridge
� PA-7200/PA-8000/PA-8200 models: MMC/SMC memory controllers
� Gecko BOA BC GSC+ Port
� LASI ASIC, which features:
– NCR 53C710 8-bit single-ended SCSI-2
– Intel 82596CA 10 Mbit Ethernet controller
– WD 16C522 compatible parallel
– Harmony CD/DAT quality 16-bit stereo audio
– NS 16550A compatible serial
� Intel 82503 Ethernet transceiver, media auto-selection
� CS4215 or AD1849 programmable CODECs
� NCR 53C720 16-bit Fast-Wide high-voltage differential (HVD) SCSI-2
� Eole CAP/MUX
� Runway CPU/memory bus (100 MHz with 800 MB peak data rate on Kx00, 120 MHz 960 MB/s
on all others)
� GSC+ bus for the general system level I/O
� HSC bus for expansion I/O
� HP-PB bus for expansion I/O
� SCSI-2 Fast-Wide high-voltage differential (HVD) bus for main storage I/O
� SCSI-2 Fast-Narrow single-ended bus for main storage I/O
Memory
� K100: 512 MB maximum RAM
� K100: 512 MB maximum RAM
� 72-pin ECC SIMMs on special RAM boards
The required access-time of the RAM modules depends on the used CPU in the system, systems with a
PA-8x00 need 50ns modules, those with PA-7200 and can take up to 60ns. It is possible that slower
modules will also work.
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