Toshiba TLP411E, Техническое учебное пособие

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6-8
The IC has a screen applicable address mode which allows
the access by specifying a horizontal and vertical addresses
in addition to the one-dimension address mode which works
as FIFO.
Fig. 6-9 HM530281RTT reset operation
Fig. 6-10 Write control signal timing diagram
The control in each mode is determined by the condition of
MODE 0 (pin 20) and MODE 1 (pin 21) when the power is
turned on and the modes are set as shown in table 6-3.
Table 6-3
Mode 0 Mode 1 Address mode Address configuration Capacity
0 0 1 dimension 0 - 10367 block 331776 word
1 0 Screen application (1) 32 block (H) x 324 line (V) 1024 dot x 324 line
0 1 Screen application (2) 36 block (H) x 288 line (V) 1152 dot x 288 line
In the unit, the address 1 mode corresponding to screen is
used. 1024 (H)
x
324 (V)
x
8 bits address corresponding to
the screen are provided. The line hold reset which returns
to the head of the current line and the line increment reset
which goes forward to the head of the next line are pro-
vided other than the normal reset which jumps to the upper
left address of the screen. (Refer to Fig. 6-9.)
These reset functions are controlled by the signal devel-
oped from pins 30 (RLRS), 31 (RRS) and 14 (WRS). Table
6-4 shows the relation of each reset terminal and reset func-
tion.
The write control to the memory is carried out by SYG
(QX32) and the read control is by PLD (QX41). The write
control signal timing is shown in Fig. 6-10 and the reset
operation is carried out at the beginning of a field and the
line increment reset is carried out at the beginning of every
line. The read control is described in the next item “2-4.
PLD Circuit”.
Reset
Line hold
Line increment
Table 6-4 Each reset terminal and its operation
Level at RCK rising timing
Mode 1
Operation mode Functions
RRS RLRS
H H Normal mode Increment syncronizing with RCK.
L H Reset Reset to upper left of screen.
H L Line increment reset Reset to head of next line.
L L Line hold reset Reset to head of current line.
WRS (WR)
WLRS (WE)
1H