MB87P2020 Datasheet, PDF (80/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
possible entries. In this Application there is no preprogrammed data transfer implemented. So the com-
mands actv, writ, read and bst should not be used. Sequence programming is done with special flow control
Table 1-3: SDRAM control commands
Mnemonic
mrs
ref
pall
actv
writ
read
bst
nop
Description
Mode Register Set
Auto/Self Refresh
Precharge all Banks
Activate Row
Write
Read
Burst Stop
No Operation
Representation
{ras, cas, we}
111
110
101
100
011
010
001
000
instructions, sub program calls, loops, power down entry and exit are supported.¹ Table 1-4 lists possible
flow control instructions and their coding.
Table 1-4: Flow control instructions
Mnemonic
run
ret
call
loop
end
pde
pdx
Description
Run linear program
flow
Return from sub rou-
tine
Call subroutine on
address argument (no
nested calls possible)
Repeat program at
address argument if
loop counter not
reached
Alias for ’loop #0’
when loop counter is
’1’
Power down entry
Power down exit
Representation
000
001
010
011
011
110
111
In general it’s recommended to use the ’mkctrl’ tool for GDC setup. It optimizes SDRAM timing based on
core clock frequency, calls the asmseq sequencer program and generates valid code for the sequencer. An
example of the micro code is provided with the assembler tools. There is also a compression tool which gen-
erates smaller programs with sub-routine calls from a linear coded micro program (asmseq_delay).
Size of sequencer memory is 64 entries for Lavender and 32 entries for Jasmine.
1.Read-write control, supported by the assembler (srw, rrw) is not implemented. There are no data
structures programmable for special transfers.
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