Pch 7791 – Acnodes PCH 7791 User Manual

Page 41

PCH 7791

17 inch Atom Fanless Panel PC

All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com.

14628 Central Ave.

Chino, CA91710

Tel:909.597.7588, Fax:909.597.1939

DR AM Timing Selectabl e

Two options are available.

Manua l (Manual setup)

By SPD (D RAM timing is set automatically according to memory SPD data)

When s electing Manual, the follo wing five i tems are configurable; whe n selecting By SPD , the

fo llowing five items are not configurable.

C AS La tency Time

Onc e a SD RAM is installed, the clock latency will be determined by D RAM c lock se ttings. The

o ptions are: 5, 4, 3 and Auto.

D RA M RAS-to-C AS D elay

You ma y set the delay period betw een CAS and R AS signal for DR AM read & write or refres hing.

Shorter delay means quic ker res ponse, while longer delay means more stable performa nce. Options

a re: 2, 3 , 4, 5, 6 and Auto.

D RA M R AS Precharge

If number of cycles is not s ufficient enough to ensure that RAS sa ves its inst ruct ions before

D RAM refre shing, it may caus e incomplete refreshing and the D RAM w ill f ail to maintain its data.

Fast er precharge means quic ker res ponse, while slower precharge means more stable perform an ce.

This item is on ly valid wh en a SD RAM is installed.

O ptions are: 2, 3, 4, 5, 6 and Auto.

Precharge Delay (t RAS)

Opt ions are: Auto and 4~15.