Vizio VX37L HDTV10A Service Manual page 70

Notes:
1. For a burst length of two, A1-A i selects the two-data-element block; A0 selects the first
access within the block.
2. For a burst length of four, A2-A i selects the four-data-element block; A0-A1 selects the
first access within the block.
3. For a burst length of eight, A3-A i selects the eight-data- element block; A0-A2 selects
the first access within the block.
4. Whenever a boundary of the block is reached within a given sequence above, the
following access wraps within the block.
Burst Type
Accesses within a given burst may be programmed to be either sequential or interleaved;
this is referred to as the burst type and is selected via bit A3. The ordering of accesses
within a burst is determined by the burst length, the burst type and the starting column
address, as shown in Burst Definition on page 11.
Read Latency
The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of
a Read command and the availability of the first burst of output data. The latency can be
programmed 2 or 2.5 clocks.
If a Read command is registered at clock edge n, and the latency is m clocks, the data is
available nominally coincident with clock edge n + m. Reserved states should not be used
as unknown operation or incompatibility with future versions may result.
Operating Mode
The normal operating mode is selected by issuing a Mode Register Set Command with
bits A7-A12 to zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by
issuing a Mode Register Set command with bits A7 and A9-A12 each set to zero, bit A8
set to one, and bits A0-A6 set to the desired values. A Mode Register Set command
issued to reset the DLL should always be followed by a Mode Register Set command to
select normal operating mode. All other combinations of values for A7-A12 are reserved
for future use and/or test modes. Test modes and reserved states should not be used as
unknown operation or incompatibility with future versions may result.
CONFIDENTIAL DO NOT COPY
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Page 7-39
File No. SG-0209