HYB39S13620TQ- Datasheet, PDF (15/70 Pages) Siemens Semiconductor Group – Special Mode Registers Two color registers Burst Read with Single Write Operation

HYB 39S16320TQ-6/-7/-8
Special Mode Register Functions
Address Bits
Functions
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0
0 0 0 1 0 0 0 0 0 Load Mask Register
0
0 0 1 0 0 0 0 0 0 Load Color Register 0
0
0 1 1 0 0 0 0 0 0 Load Color Register 1
Note: If only one Color Register is in use, A7 is Don’t Care.
Special Mode Register Naming Conventions
Address bit name
A5
A6
A7
Special name
LM
LC
SCR
Function
Load Mask Enable
Load Color Enable
Select Color Register
Device Deselect (INHBT)
The device deselect or inhibit function prevents commands from being executed by the SGRAM,
regardless of whether the CLK signal is enabled. The device is effectively deactivated (CS is high).
No Operation (NOP)
The NOP command is used to perform a no operation to an SGRAM which is selected (CS is low).
This prevents unwanted commands being registered during idle or wait states. The execution of the
command(s) already in progress will not be affected.
Load Mode Register (LMR)
The Mode Register is loaded via address input pins A9 - A0 . The LMR command can only be issued
when both banks are idle, and a subsequent executable command can not be issued until 2 CLK
cycle Latency is met.
Load Special Mode Register (LSMR)
LSMR command is used to load either the Color Register(s) or the Mask Register at a time. The
control information is provided on inputs A9 - A0, while the data for the Color or Mask Register is
provided on the DQs. The LSMR command can be issued when both banks are idle, or one or both
are active but with no Read, Write or Block Write accesses in progress.
Semiconductor Group
15
1998-10-01