LSI Logic Confidential
13-12
SDRAM Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
LastDin2P Latency
[17:16]
LastDin2P. LastData in to Row Precharge(tRDL). This
indicates how soon after the last data write row
precharge can take place. The actual value is
(programmed 1).
There is a similar parameter for read case, but it is
typically tied to CAS Latency number and can be same
as CAS Latency.
WrC2D
15
WriteC2D Latency. WriteCommand to Data latency
specifies the minimum number clocks between the write
command and the first data for that command.
0 = 0 clock. Typically for SDRAM.
1 = 1 clock. Typically for DDR.
ActiveP Latency
[14:12]
ActiveP latency (tRAS) specifies the minimum number of
clocks between activate and precharge commands to the
same bank. The actual value is (programmed 4).
Prech Latency
[11:10]
Prech latency(tRP) specifies the minimum number of
clocks between a precharge command and an activate
command to the same bank. The actual value is
(programmed 2).
Act L
9
ActiveO latency(tRRD) specifies the minimum number
clocks between successive activate commands to
different banks.
0 = 2 clocks. Powers up as 0.
1= 3 clocks.
RAS Latency
[8:7]
RAS latency(tRCD) specifies the minimum number clocks
between an activate command and a read or write. Active
command to Active Command duration (tRC) is not
programmed since it is (tRAS + tRP). The actual value is
(programmed 1).
Содержание DMN-8600
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