Board Circuit Description - Sony NWS-1510 Service Manual

3-9. DSC- 008 board circuit description(NWS-1530/1580 Only)
3-9-1. Points of difference with present bitmap display controller
*First stage FIFO (cycle time: 6 clock, 240 nsec - 300 nsec).
*
Second operand and mask raster operation support.
* The kanji ROM has been allocated to a portion of the FB.
* It is now possible to copy from any plane to all planes within the FB.
3-9-2. Special color bitmap board addresses
Two DIP switches on the board allow changing
(1) Raster operation command registers
SWl SWO Address
0 0 OxfOf 20000-0xfOf 3f ff f
0
1 Oxf0f 60000-0xf0f7ffff
1 0
OxfOfaOOOO-OxfOfbf ff f
1
1 OxfOfeOOOO-OxfOf ff ff f
(2)
CRTC,
status, color palette
SWl
swo
Status CRTC
0
0 OxfOf 00000 OxfOf 02000
0 1 OxfOf 40000 OxfOf 42000
1 0 OxfOf 80000 OxfOf 82000
1 1 OxfOf cOOOO Oxf0fc2000
of addresses.
Color palette
OxfOf 04000
OxfOf 44000
OxfOf 84000
Oxf0f c4000
Normally, SWl and SWO are both set to
~.
3-9-3. CRTC, color palette
(1) Monitor timing (NWP - 515)
Drive system Non - interlaced
Pixels clock
Number of horizontal display pixels
Number of horizontal blanking pixels
Total number of horizontal pixels
Horizontal cycle
Horizontal frequency
Horizontal front porch
Horizontal sync cycle
Horizontal back porch
Number of vertical display lines
Number of vertical blanking lines
Total number of vertical lines
Vertical cycle
Vertical frequency
Vertical front porcn
Vertical sync cycle
Vertical back porch
(2) HD6445 CRTC register settings
64MHz
1024dot
288dot(4.5usec)
1312dot
20.5usec
48.78kHZ
64dot(lusec)
96dot ( 1. 5usec)
128dot(l.5usec)
768line
45line(922.5usec)
813line
16.660msec
60.0Hz
31line
31line ( 61. 5uaec)
39line(799.5usec)
HD644CRTC generates horizontal and vertical sync signals for the NWP- 515 as well as
display blanking timing. HD6445 operates on a frequency equal to the pixel clock
divided by 16 because of constraints imposed by its maximum operating frequency. It
is therefore possible to set display timing in units of 16 horizon- tal pixels. For
this reason, HD6445 sets the following values:
NWS-1510/1530/1580
3-41