Vizio L37 Service Manual page 83

Read Command
Writes
Write bursts are initiated with a Write command, as shown in timing figure Write Command on
following:
The starting column and bank addresses are provided with the Write command, and Auto Precharge is
either enabled or disabled for that access. If Auto Precharge is enabled, the row being accessed is
precharged at the completion of the burst. For the generic Write commands used in the following
illustrations, Auto Precharge is disabled.
During Write bursts, the first valid data-in element is registered on the first rising edge of DQS following
the write command, and subsequent data elements are registered on successive edges of DQS. The
Low state on DQS between the Write command and the first rising edge is known as the write
preamble; the Low state on DQS following the last data-in element is known as the write postamble.
The time between the Write command and the first corresponding rising edge of DQS (tDQSS) is
specified with a relatively wide range (from 75% to 125% of one clock cycle), so most of the Write
diagrams that follow are drawn for the two extreme cases (i.e. tDQSS(min) and tDQSS(max)). Timing
figure Write Burst (Burst Length = 4) on page 33 shows the two extremes of tDQSS for a burst of four.
Upon completion of a burst, assuming no other commands have been initiated, the DQs and DQS
enters High-Z and any additional input data is ignored.
CONFIDENTIAL – DO NOT COPY Page 8-47
File No. SG-0176