V VIZIO P42HDTV10A, Service Manual

Page: 45 / 219

CONFIDENTIAL – DO NOT COPY Page 8- 13
File No. SG-0184
3. Precharge
The precharge command is used to precharge or close a bank that has activated. The
precharge command is issued when CS, RAS and WE are low and CAS is high at the rising
edge of the clock. The precharge command can be used to precharge each bank respectively
or all banks simultaneously. The bank select addresses (BA0, BA1) are used to define which
bank is precharged when the command is initiated. For write cycle, tWR(min.) must be
satisfied until the precharge command can be issued. After tRP from the precharge, an active
command to the same bank can be initiated.
Burst Selection for Precharge by Bank address bits
A10/AP BA1 BA0 Precharge
0 0 0 Bank A Only
0 0 1 Bank B Only
0 1 0 Bank C Only
0 1 1 Bank D Only
1 X X All Banks