Biostar K8NHA GRAND K8NHA Grand BIOS setup guide - Page 14

Row cycle time (tRC) This field specifies the ROW Cycle Time. RAS# active to RAS# active or auto refresh of the same bank. Typically -70 Nsec. The Choices: 9 BUS CLOCKS (Default), 7 BUS CLOCKS, 8 BUS CLOCKS, 10 BUS CLOCKS, 11 BUS CLOCKS, 12 BUS CLOCKS, 13 BUS CLOCKS, 14 BUS CLOCKS, 15 BUS CLOCKS, 16 BUS CLOCKS, 17 BUS CLOCKS, 18 BUS CLOCKS, 19 BUS CLOCKS, 20 BUS CLOCKS, 21 BUS CLOCKS, 22BUS CLOCKS. Row refresh cyc time (tRFC) This field specifies the ROW Refresh Cycle Time. Auto-refresh active to RAS# active or RAS# to Auto-refresh. Similar to Trc. Typically 75-90 Nsec. The Choices: 10 BUS CLOCKS (Default), 9 BUS CLOCKS, 11 BUS CLOCKS, 12 BUS CLOCKS, 13 BUS CLOCKS, 14 BUS CLOCKS, 15 BUS CLOCKS, 16 BUS CLOCKS, 17 BUS CLOCKS, 18 BUS CLOCKS, 19 BUS CLOCKS, 20 BUS CLOCKS, 21 BUS CLOCKS, 22 BUS CLOCKS, 23 BUS CLOCKS, 24 BUS CLOCKS RAS# to CAS# Delay (tRCD) This field specifies the RAS# to CAS# Delay to read/ write command to the same bank. Typically -20 Nsec. The Choices: 3 BUS CLOCKS (Default), 2 BUS CLOCKS, 4 BUS CLOCKS, 5 BUS CLOCKS, 6 BUS CLOCKS, 7 BUS CLOCKS Row to Row Delay (tRRD) This field specifies the Row# of different banks. Typically -15 Nsec. The Choices: 2 BUS CLOCKS (Default), 3 BUS CLOCKS, 4 BUS CLOCKS. Min RAS# active time (tRAS) This field specifies the minimum RAS# active time. Typically -45-60 Nsec. The Choices: 6 BUS CLOCKS (Default), 13 BUS CLOCKS, 14 BUS CLOCKS, 15 BUS CLOCKS. Row precharge Time (tRP) This field specifies the Row precharge Time. Precharge to Active or Auto-Refresh of the same bank. Typically 20-24 Nsec. The Choices: 3 BUS CLOCKS (Default), 2 BUS CLOCKS, 4 BUS CLOCKS, 5 BUS CLOCKS, 6 BUS CLOCKS. Write recovery time (tWR) This bit specifies the Write recovery time. Called Trdl by Samsung, measures when the last write datum is safely registered by the DRAM. It measures from the last data to precharge. Samsung measures as 1.25 -1.75CK but Jedec says 15-20 ns. The Choices: 2 BUS CLOCKS (Default), 3 BUS CLOCKS 13